Compositions and methods for controlling the weight of animals

Abstract

Compositions are provided comprising a balance between lysine and essential amino acids and metabolizable energy. The compositions are useful in methods to prevent or treat obesity in an animal without concomitant loss of lean muscle mass. The compositions may also be used in methods to preserve or to cause a gain in lean muscle mass in an animal in need thereof.

Claims

1. A method to treat obesity in an animal without concomitant loss of lean muscle mass comprising administering to said animal a composition comprising about 1.4 to about 2.1% lysine, wherein the composition has a leucine to lysine ratio of about 1.7 to about 2.7, a methionine+cysteine to lysine ratio of about 0.5 to about 1.5, a phenylalanine+tyrosine to lysine ratio of about 1.3 to about 2.1, about 4 to about 8 grams of lysine per Mcal, and about 20 to about 30% dietary fiber.

2. A method for the preservation of lean muscle mass in an animal comprising administering to the animal a composition comprising about 1.4 to about 2.1% lysine, wherein the composition has a leucine to lysine ratio of about 1.7 to about 2.7, a methionine+cysteine to lysine ratio of about 0.5 to about 1.5, a phenylalanine+tyrosine to lysine ratio of about 1.3 to about 2.1, about 4 to about 8 grams of lysine per Mcal, and about 20 to about 30% dietary fiber.

3. A method for the gain of lean muscle mass in an animal comprising administering to said animal a composition comprising about 1.4 to about 2.1% lysine, wherein the composition has a leucine to lysine ratio of about 1.7 to about 2.7, a methionine+cysteine to lysine ratio of about 0.5 to about 1.5, a phenylalanine+tyrosine to lysine ratio of about 1.3 to about 2.1, about 4 to about 8 grams of lysine per Mcal, and about 20 to about 30% dietary fiber.

4. The method of claim 1 wherein the animal is a companion animal.

5. The method of claim 4 wherein the companion animal is a dog.

6. The method of claim 1, wherein the composition comprises about 8 to about 14% crude fiber.

7. The method of claim 1, wherein the composition comprises about 1.2 to about 4.0% soluble fiber.

8. The method of claim 1, wherein the composition has about 4.2 to about 6.8 grams of lysine per Mcal.

9. The method of claim 1, wherein the composition has about 1.5% to about 1.9% lysine.

10. The method of claim 1, wherein the composition has a leucine to lysine ratio of about 2.0 to about 2.4.

11. The method of claim 1, wherein the composition has a methionine+cysteine to lysine ratio of about 0.8 to about 1.2.

12. The method of claim 1, wherein the composition has a phenylalanine+tyrosine to lysine ratio of about 1.5 to about 1.9.

13. The method of claim 1, wherein the composition has a tryptophan to lysine ratio of about 0.1 to about 0.2.

14. The method of claim 1, wherein the composition has a threonine to lysine ratio of about 0.5 to about 0.9.

15. The method of claim 1, wherein the composition has an arginine to lysine ratio of about 0.75 to about 1.2.

16. The method of claim 1, wherein the composition has an isoleucine to lysine ratio of about 0.51 to about 0.82.

17. The method of claim 1, wherein the composition has a valine to lysine ratio of about 0.6 to about 1.0.

18. The method of claim 1, wherein the composition has a histidine to lysine ratio of about 0.3 to about 0.5.

19. The method of claim 1, wherein the composition has a methionine to lysine ratio of about 0.5 to about 0.9.

20. The method of claim 1, wherein the composition has a metabolizable energy content of about 2600 to about 3950 Kcal/kg.

21. The method of claim 1, wherein the composition further comprises about 75 to about 200 ppm manganese.

22. The method of claim 1, wherein the composition further comprises about 200 to about 500 ppm L-carnitine.

23. The method of claim 1, wherein the composition further comprises about 24 to about 41% crude protein.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) It is contemplated that the invention described herein is not limited to the particular methodology, protocols, and reagents described as these may vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention in any way.

(2) Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. All patents, patent applications, publications, and other references cited or referred to herein are incorporated by reference for all purposes.

(3) As used herein and in the appended claims, the singular forms a, an, and the include plural reference unless the context clearly dictates otherwise.

(4) As used herein, the terms overweight, fat, obese, obesity and like terms refer to a body weight condition of an animal that is more than its' ideal weight. For example, the term fat as applied to an animal can mean any animal that is determined to have an excess amount of body adipose tissue or an animal that is prone to developing an excess amount of body adipose tissue using techniques and methods known to veterinary care professionals and others of skill in the art. For example, an animal is considered fat if (1) the animal has a Body Mass Index (BMI) of 25 or more (a number considered to include overweight and obese animals in some methods of characterizing animal conditions), (2) the animal's weight is 15% or more than its ideal body weight as defined by veterinary care professionals, or as known to one of skill in the art, (3) an animal's percent body fat is 27% or more as determined by dual-energy X-ray absorptiometry (DEXA), or (4) an animal has a body condition score (BCS) of more than 3 on a scale from 1 to 5 as determined by one of skill in the art using the method disclosed in Small Animal Clinical Nutrition, 4.sup.th Edition, in Chapter 13 (ISBN 0-945837-05-4) or its equivalent using other BCS methods. In some cases, animals that are 20% or more over ideal body weight are considered obese.

(5) As used herein, treatment of obesity refers to the reduction of body weight of an obese animal until the animal has achieved its ideal body weight, as determined according to conventional methods, e.g., by administering an effective amount of a composition of the present invention to an animal. Prevention of obesity refers to preventing an animal from attaining a body weight condition that would be deemed by one of skill in the art as being more than ideal for the animal, e.g., by administering an effective amount of a composition of the present invention to the animal.

(6) As used herein, an amount effective, an effective amount, and like terms refer to that amount of a compound, material or composition as described herein that may be effective to achieve a particular biological result. Such results may include, but are not limited to the treatment and/or prevention of obesity and/or the preservation or gain of lean muscle mass. Such effective activity may be achieved, for example, by administration of compositions of the present invention to an animal. An effective amount may be based on several factors, including an animal's ideal weight, the metabolizable energy of the composition, and frequency of feeding the animal compositions of the present invention, e.g., once, twice, or three times daily, and other compositions fed to the animal.

(7) As used herein, an effective amount of time may be determined by observing or measuring the weight, weight loss, or lean muscle gain in an animal, and may be determined by one of skill in the art without undue experimentation.

(8) The present invention relates to any animal, preferably a mammal, more preferably a companion animal. The term companion animal refers to any animal that lives in close association with humans and includes, but is not limited to, canines and felines of any breed. For example, it is contemplated herein that this term may also encompass any animal whose diet may be controlled by humans and which may benefit from feeding the formulations disclosed herein. These animals may include, for example, domesticated farm animals (e.g. cattle, horses, swine, etc.) as well as undomesticated animals held in captivity, e.g. in zoological parks and the like. Preferably, companion animals are cats and dogs, preferably dogs.

(9) All percentages expressed herein are on a weight by dry matter basis unless specifically stated otherwise.

(10) Without being limited to any theory or particular mode of action, the present invention is based on the surprising discovery that certain compositions can be used to prevent and/or treat obesity while preserving or causing a gain in lean muscle mass by balancing the lysine content of the composition in particular ratios to other amino acids is the composition. Preferably, lysine is balanced to one or more essential amino acids (e.g., phenylalanine, leucine, methionine, isoleucine, valine, threonine, tryptophan, histidine and arginine). More preferably, lysine is balanced to one or more essential amino acids, including one or more limiting amino acids (methionine, cysteine, tryptophan). The lysine ratio may be expressed against one or more amino acids. Balancing the ratio of lysine to metabolizable energy is also important in the present invention.

(11) As contemplated herein, the compositions of the present invention are meant to encompass nutritionally complete and balanced pet food compositions. Nutritionally complete and balanced pet food compositions are familiar to one of skill in the art. For example, nutrients and ingredients such as those disclosed herein as well as others suitable for animal feed compositions, and recommended amounts thereof, may be found, for example, in the Official Publication of the Associate of American Feed Control Officials (AAFCO), Inc., Nutrient Requirements of Dogs and Cats, 2006.

(12) Protein may be supplied by any of a variety of sources known by those skilled in the art, including plant sources, animal sources, or both. Animal sources include, for example, meat, meat by-products, seafood, dairy, eggs, etc. Meats include, for example, the flesh of poultry, fish, and mammals (e.g., cattle, pigs, sheep, goats, and the like). Meat by-products include, for example, lungs, kidneys, brain, livers, and stomachs and intestines (freed of all or essentially all their contents). The protein can be intact, almost completely hydrolyzed, or partially hydrolyzed. Protein content of foods may be determined by any number of methods known by those of skill in the art, for example, as published by the Association of Official Analytical Chemists in Official Methods of Analysis (OMA), method 988.05. The amount of crude protein in a composition disclosed herein may be determined based on the amount of nitrogen in the composition according to methods familiar to one of skill in the art.

(13) Fat can be supplied by any of a variety of sources known by those skilled in the art, including meat, meat by-products, fish oil, and plants. Plant fat sources include wheat, flaxseed, rye, barley, rice, sorghum, corn, oats, millet, wheat germ, corn germ, soybeans, peanuts, and cottonseed, as well as oils derived from these and other plant fat sources. Fat content of foods may be determined by any number of methods known by those of skill in the art, such as by OMA methods 920.39, 954.02 and 960.39.

(14) Carbohydrate may be supplied by any of a variety of sources known by those skilled in the art, including oat fiber, cellulose, peanut hulls, beet pulp, parboiled rice, corn starch, corn gluten meal, and any combination of those sources. Grains supplying carbohydrate include, but are not limited to, wheat, corn, barley, and rice. Carbohydrate content of foods may be determined by any number of methods known by those of skill in the art. Generally, carbohydrate percentage may be calculated as nitrogen free extract (NFE), which may be calculated as follows: NFE=100%moisture %protein %fat %ash %crude fiber %.

(15) Dietary fiber refers to components of a plant which are resistant to digestion by an animal's digestive enzymes. Dietary fiber components of foods may be determined by any number of methods known by those of skill in the art, such as OMA method 991.43/32.1.17 (1994). Dietary fiber includes soluble and insoluble fibers.

(16) Soluble fiber are resistant to digestion and absorption in the small intestine and undergo complete or partial fermentation in the large intestine, e.g., beet pulp, guar gum, chicory root, psyllium, pectin, blueberry, cranberry, squash, apples, oats, beans, citrus, barley, or peas. Insoluble fiber may be supplied by any of a variety of sources, including cellulose, whole wheat products, wheat oat, corn bran, flax seed, grapes, celery, green beans, cauliflower, potato skins, fruit skins, vegetable skins, peanut hulls, and soy fiber. Soluble and insoluble fiber content of foods may be determined by any number of methods known by those of skill in the art, preferably OMA method 991.43/32.1.17 (1994).

(17) Crude fiber includes indigestible components contained in cell walls and cell contents of plants such as grains, e.g., hulls of grains such as rice, corn, and beans. Crude fiber content of foods may be determined by any number of methods known by those of skill in the art, such as by OMA 16th edition method 962.09/4.6.01.

(18) The amino acid percentage of the compositions in the present invention may be determined by any means known in the art. For example, the values for the total amount of lysine provided by the invention can be determined using methods known in the art, including OMA methods 975.44, 988.15 and 994.12 (1995). As another example, tryptophan content may be determined according to OMA method 988.15 (1995); methionine, cysteine and other amino acid content may be determined according to OMA method 994.12 (1995). Amino acid content may also be determined according to OMA method 982.30. The essential amino acids in the present compositions may be supplied by any number of sources, including crude protein, or addition of free amino acids to the composition.

(19) Metabolizable energy (ME) of a diet is the energy available to an animal upon consumption of the diet after subtracting the energy excreted in feces, urine, and combustible gases. Metabolizable energy values may be determined by methods known by those skilled in the art, such as detailed in Association of American Feed Control Officials: Official Publication, Atlanta, Ga., pages 160-165 (2006).

(20) Ash consists of compounds that are not organic or water, generally produced by combustion of biological materials. Ash may be determined by any number of methods known by those of skill in the art, such as OMA method 942.05.

(21) Carnitine, or L-carnitine, is a vitamin-like compound synthesized in the body from lysine and methionine. Carnitine may be naturally present in ingredients of the of the present invention, or carnitine may be added to the compositions. Methods of measuring carnitine are known in the art, such as described in R. Parvin and S. V. Pande, Microdetermination of ()Carnitine and Carnitine Acetyltransferases Activity, ANALYTICAL BIOCHEMISTRY, vol. 79, pp. 190-201 (1977).

(22) The compositions of the present invention also contain one or more minerals and/or trace elements, e.g., calcium, phosphorus, sodium, potassium, magnesium, manganese, copper, zinc, choline, or iron salts. One preferred trace element is manganese. Manganese is essential to a host of enzymes as a cofactor, which may regulate the metabolism of foods, including proteins, fats, and carbohydrates. Such enzymes may include oxidoreductases, transferases, hydrolases, lyases, isomerases, ligases, lectins, and integrins. Manganese also affects bone development and neurological function. Manganese may be naturally present in the components of the compositions, or it may be added to compositions. Methods of measuring manganese content in a composition are well known to those of skill in the art, such as OMA 965.17 and 985.01.

(23) The compositions of the present invention may also include vitamins and minerals in amounts required to avoid deficiency and maintain health. These amounts, and methods of measurement are known by those skilled in the art. For example, AAFCO provides recommended amounts of such ingredients for dogs and cats. As contemplated herein, useful vitamins may include, but are not limited to, vitamin A, vitamin B.sub.1, vitamin B.sub.2, vitamin B.sub.6, vitamin B.sub.12, vitamin C, vitamin D, vitamin E, vitamin H (biotin), vitamin K, folic acid, inositol, niacin, and pantothenic acid.

(24) The compositions of the present invention may additionally comprise additives, stabilizers, fillers, thickeners, flavorants, palatability enhancers and colorants in amounts and combinations familiar to one of skill in the art.

(25) In one embodiment, the compositions are in the form of a food or pet food. In another embodiment, the composition is a treat. Treats are known to those skilled in the art, and can include, for example, compositions that are given to an animal to eat during non-meal time, e.g., a dog biscuit.

(26) While foods of any consistency or moisture content are contemplated, preferably the compositions of the present invention may be, for example, a wet or dry animal food composition. Wet food refers to food which has a moisture content of about 70 to about a 90%. Dry food refers to compositions with about 5 to about 15% moisture content and is often manufactured in the form of small bits or kibbles. Also contemplated herein are compositions that may comprise components of various consistency as well as components that may include more than one consistency, for example, soft, chewy meat-like particles as well as kibble having an outer cereal component and an inner cream component as described in, e.g., U.S. Pat. No. 6,517,877. The kibble may then be dried and optionally coated with one or more topical coatings known by those skilled in the art, for example, flavors, fats, oils, powders, and the like.

(27) In accordance with the present invention, compositions 1.0-2.15 can be administered to an animal to prevent or treat obesity in the animal, preferably without loss of lean muscle mass. Prevention of obesity may be accomplished by administering to an animal an effective amount of the compositions of the present invention over a period of time, monitoring the animal's weight adipose tissue, and lean muscle mass, and adjusting the amount of food fed to the animal to prevent the animal from gaining excess adipose tissue and preserve or cause a gain in lean muscle mass. Treatment of obesity may be accomplished by administering to an animal an effective amount of the compositions of the present invention and monitoring the animal's adipose tissue content until the animal has lost sufficient adipose tissue to be considered an ideal weight, as understood by one of skill in the art.

(28) In accordance with the present invention, compositions 1-2.15 can be fed to an animal, not only to treat obesity without loss of lean muscle, but to cause gain of lean muscle in an animal in need thereof. Said animal need not be obese; gain of lean muscle may be desirable in animals whose lean muscle mass is less than ideal due to any number of factors including, e.g., age, disease, or malnutrition. Gain of lean muscle may be accomplished by administering to an animal an effective amount of the compositions of the present invention while monitoring the animal's lean muscle content until the animal has gained a sufficient amount of lean muscle to be considered an ideal weight, or sufficient as determined by one of skill in the art.

(29) The compositions and methods of the present invention may be part of an overall weight loss program, for example, the compositions and methods may be used in combination with regular exercise and restricted access to treats, table scraps or other pet snacks.

(30) The present invention also includes the use of any one of compositions 1.0-2.15 to prevent or treat obesity, and/or to preserve lean muscle, and/or to cause gain of lean muscle. The present invention also includes the use of any one of compositions 1.0-2.15 in the manufacture of a food composition, preferably a pet food composition, more preferably a dog food, to prevent or treat obesity, and/or to preserve lean muscle, and/or to cause gain of lean muscle.

EXAMPLES

Example 1

Formulation of Compositions

(31) The following compositions of Table 1 are formulated in accordance with the Association of American Feed Control Officials 2005 nutrient guide for dogs, balanced to meet adult maintenance requirements, and extruded as a dry kibble. The contents of the compositions are analyzed by methods known in the art.

(32) TABLE-US-00001 TABLE 1 Control Formula A Formula B Crude Protein, % 28.34 33.87 33.42 Crude Fat, % 9.65 8.54 9.05 Crude Fiber, % 20.87 10.33 11.57 Total Dietary Fiber, % 33.54 25.4 25.39 Soluble Fiber, % 0.98 3.01 1.61 Ash, % 5.08 6.3 6.16 Calcium, % 0.79 0.93 0.93 Phosphorous, % 0.61 0.8 0.79 Manganese, ppm 30 100 100 Lysine, % 1.51 1.74 1.70 Methionine, % 0.50 1.23 1.24 Methionine + Cysteine, % 0.83 1.65 1.67 Tryptophan, % 0.28 0.27 0.24 Threonine, % 1.07 1.24 1.22 Arginine, % 1.55 1.64 1.71 Isoleucine, % 1.02 1.19 1.09 Valine, % 1.23 1.39 1.29 Leucine, % 2.21 3.82 3.74 Histidine, % 0.60 0.69 0.67 Phenylalanine + Tyrosine, % 1.81 2.91 2.92 Carnitine (Added), ppm 300 300 300 Linolenic acid, % 0.32 0.96 0.29 Linoleic acid, % 3.04 2.03 2.90 Metabolizable Energy, 2940 3283 3241 kcal/kg Lysine: Calorie 5.14 5.30 5.25 Methionine + cysteine: 0.55 0.95 0.98 Lysine Tryptophan: Lysine 0.19 0.16 0.14 Threonine: Lysine 0.71 0.71 0.72 Arginine: Lysine 1.03 0.94 1.01 Isoleucine: Lysine 0.68 0.68 0.64 Valine: Lysine 0.81 0.80 0.76 Leucine: Lysine 1.46 2.20 2.20 Histidine: Lysine 0.40 0.40 0.39 Phenylalanine + Tyrosine: 1.20 1.67 1.72 Lysine

Example 2

Canine Weight Loss Study

(33) Thirty obese dogs (beagles) are utilized in a 120 day weight loss study. All dogs have a percent body fat (total weight) of greater than 26%. The dogs are randomly divided into three groups, and fed either Control, Formula A, or Formula B. Dogs are fed amounts according to their ideal body weight, i.e., the number of kcal per day according to a dog's ideal body weight and is calculated as follows:

(34) a dog's ideal body weight is calculated as:

(35) $W_1=\frac{W_0-W_0\left(F_0/100\right)}{\left(1-F_1/100\right)}$
wherein W.sub.1=ideal weight (kg), W.sub.0=initial weight (kg), F.sub.0=measured body fat (%), and F.sub.1=ideal body fat (%). Dogs utilized in the study are deemed to have an ideal body fat of 20%. The number of kcal fed per day according to a dog's ideal body weight is calculated as follows:
1.6(70*W.sub.1).sup.3/4=kcal/day fed to a dog according to its ideal body weight.

(36) The amount of food fed per dog is determined by dividing the number of kcal per day for a dog according to ideal body weight by the number of kcal per kilogram of food, i.e., kcal/kg of Control, Formula A, and Formula B.

(37) During the study, each dog undergoes DEXA scans (DXA-QDR-4500, Hologic, Inc., Waltham, Mass.) at days 0, 30, 60, 90, and 120 days to measure lean muscle, and body fat. At days 0 and 30, n=10 for dogs each fed Control, Formula A, and Formula B compositions. Dogs are removed from the study when they achieve less than 25% body fat. At day 60), 4 dogs fed Formula A and 2 dogs fed Formula B are removed from the study. Thus, for data at day 90:

(38) n=10 for dogs fed Control;

(39) n=6 for dogs fed Formula A; and

(40) n=8 for dogs fed formula B.

(41) At day 90, 2 dogs fed Control, 4 dogs fed Formula A and 3 dogs fed Formula B are removed from the study. Thus, for data at day 120:

(42) n=8 for dogs fed Control;

(43) n=7 for dogs fed Formula A; and

(44) n=5 for dogs fed Formula B.

(45) Results of the study are provided in the following tables:

(46) TABLE-US-00002 TABLE 2 Total body mass of dogs Total Weight (g) Control Formula A Formula B Day 0 15866 920 16645 920 17686 920 Day 30 14797 881 15114 881 16180 881 Day 60 14598 904 14539 904 15739 953 Day 90 13815 880 14820 1136 16160 984 Day 120 13977 1016 15729 1659 15942 1285 Change day 0 to 30 1069 262 1531 262 1506 262 Change day 0 to 60 1268 314 2105 314 2166 331 change day 0 to 90 2051 291 1809 376 2347 326 Change day 0 to 120 2456 349 1892 570 2408 441 Day 0 vs day 30* <0.01 <0.01 <0.01 Day 0 vs day 60* <0.01 <0.01 <0.01 Day 0 vs day 90* <0.01 <0.01 <0.01 Day 0 vs day 120* <0.01 <0.01 <0.01 *Probability of greater F value

(47) TABLE-US-00003 TABLE 2A Analysis of dog body mass change Control vs. Formula Control vs. Formula Formula A vs Total Weight (g) A* B* Formula B* Day 0 ND ND ND Day 30 ND ND ND Day 60 ND ND ND Day 90 ND ND 0.09 Day 120 ND ND ND Change day 0 to 30 ND ND ND Change day 0 to 60 0.07 0.06 ND Change day 0 to 90 ND ND ND Change day 0 to 120 ND ND ND *Probability of greater F value, ND = No difference

(48) TABLE-US-00004 TABLE 3 Lean muscle mass of dogs Muscle (g) Control Formula A Formula B Day 0 9840 563 10161 563 10864 563 Day 30 9266 479 9775 479 10389 479 Day 60 8713 493 10502 493 11250 519 Day 90 9452 498 9843 643 10997 557 Day 120 9183 507 9520 828 10368 641 Change day 0 to 30 g 573 159 386 159 475 159 Change day 0 to 60, g 1126 155 341 155 235 163 Change day 0 to 90, g 387 198 153 256 284 221 Change day 0 to 120, g 832 255 748 416 457 323 Day 0 vs Day 30* <0.01 0.02 <0.01 Day 0 vs day 60* <0.01 0.04 ND Day 0 vs day 90* 0.06 ND ND Day 0 vs day 120* <0.01 ND ND *Probability of greater F value, ND = No difference

(49) TABLE-US-00005 TABLE 3A Analysis of dog muscle mass change Control vs Formula A Formula Control vs Formula vs Muscle (g) A* B* Formula B* Day 0 ND ND ND Day 30 ND ND ND Day 60 0.02 <0.01 ND Day 90 ND 0.05 ND Day 120 ND ND ND Change day 0 to 30 g ND ND ND Change day 0 to 60, g <0.01 <0.01 ND Change day 0 to 90, g ND ND ND Change day 0 to 120, g ND ND ND *Probability of greater F value, ND = NO difference

(50) TABLE-US-00006 TABLE 4 Fat mass of dogs Fat (g) Control Formula A Formula B Day 0 5602 446 5997 446 6321 446 Day 30 5128 503 4876 503 5315 503 Day 60 5491 528 3571 528 4005 557 Day 90 3964 521 4520 673 4680 583 Day 120 4395 608 5761 993 5103 769 Change day 0 to 30 474 212 1121 212 1006 212 Change day 0 to 60 111 284 2426 284 2374 799 Chance day 0 to 90 1638 211 1632 273 2021 236 Change day 0 to 120 1592 249 1104 407 1899 315 Day 0 vs day 30* 0.03 <0.01 <0.01 Day 0 vs day 60* ND <0.01 <0.01 Day 0 vs day 90* <0.01 <0.01 <0.01 Day 0 vs day 120* <0.01 0.02 <0.01 *Probability of greater F value, ND = No difference

(51) TABLE-US-00007 TABLE 4A Analysis of fat mass change Control vs Formula Control vs Formula Formula A vs Fat (g) A* B * Formula B* Day 0 ND ND ND Day 30 ND ND ND Day 60 0.02 0.06 ND Day 90 ND ND ND Day 120 ND ND ND Change day 0 to 30 0.04 0.09 ND Change day 0 to 60 <0.01 <0.01 ND Change day 0 to 90 ND ND ND Change day 0 to 120 ND ND ND *Probability of greater F value, ND = No difference

(52) The results indicate that although all animals lose lean muscle in the first 30 days of the study, animals fed Formulas A and B statistically lose more adipose tissue than animals fed Control. The results also indicate that at day 60, animals fed Formulas A and B regain lean muscle (compared with Control).

Example 3

Formulation of Compositions

(53) Compositions are formulated in accordance with the specifications of Table 5 on a dry matter basis:

(54) TABLE-US-00008 TABLE 5 Minimum Target Maximum Protein % 33 35 36 Soluble Fiber % 1.2 4 Insoluble Fiber % 23 25 Dietary Fiber % 24 27 Lysine:energy (g/Mcal) 5.7 Leucine:Lysine ratio 2 Methionine % 1.4 1.5 Manganese (ppm) 100 Carnitine (ppm) 300 350

Example 4

Formulation of Dry Composition

(55) The composition of Example 3 is formulated as a dry dog food having a metabolizable energy content of about 3100 kcal/kg.

Example 5

Formulation of Wet Composition

(56) The composition of Example 3 is formulated as a wet dog food having a metabolizable energy content of about 900 kcal/kg on a wet matter basis.

(57) While particular embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that changes and modifications may be made without departing from the broader aspects of invention.