A nutrient composition comprises an essential nutrient in which at least one exchangeable H atom is .sup.2H and/or at least one C atom is .sup.13C. The nutrient is thus protected from, inter alia, active oxygen species.

A nutrient composition comprises an essential nutrient in which at least one exchangeable H atom is .sup.2H and/or at least one C atom is .sup.13C. The nutrient is thus protected from, inter alia, active oxygen species.

The invention relates to compositions comprising Lactobacillus plantarum, and methods and uses of said compositions for preventing and/or treating mental illness, symptoms affecting mental health and/or conditions associated with chronic stress, in a mammal. The invention can be applied in restoring, maintaining, and/or promoting mental (including cognitive) health and has potential applications, inter alia, in the area of dietary and food supplements, medicaments and pharmaceuticals.

The invention relates to compositions comprising Lactobacillus plantarum, and methods and uses of said compositions for preventing and/or treating mental illness, symptoms affecting mental health and/or conditions associated with chronic stress, in a mammal. The invention can be applied in restoring, maintaining, and/or promoting mental (including cognitive) health and has potential applications, inter alia, in the area of dietary and food supplements, medicaments and pharmaceuticals.