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Weight loss, in the context of medicine, health, or physical fitness, refers to a reduction of the total body mass, by a mean loss of fluid, body fat (adipose tissue), or lean mass (namely bone mineral deposits, muscle, tendon, and other connective tissue).

Weight loss can either occur unintentionally because of malnourishment or an underlying disease, or from a conscious effort to improve an actual or perceived overweight or obese state.

"Unexplained" weight loss that is not caused by reduction in calorific intake or exercise is called cachexia and may be a symptom of a serious medical condition.

A healthy diet is a diet that maintains or improves overall health.

A healthy diet provides the body with essential nutrition: fluid, macronutrients such as protein, micronutrients such as vitamins, and adequate fibre and food energy.

In common usage and medicine, health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity".

A variety of definitions have been used for different purposes over time.

Health can be promoted by encouraging healthful activities, such as regular physical exercise and adequate sleep, and by reducing or avoiding unhealthful activities or situations, such as smoking or excessive stress.

Some factors affecting health are due to individual choices, such as whether to engage in a high-risk behavior, while others are due to structural causes, such as whether the society is arranged in a way that makes it easier or harder for people to get necessary healthcare services.

Still, other factors are beyond both individual and group choices, such as genetic disorders.

Exercise is a body activity that enhances or maintains physical fitness and overall health and wellness.

In nutrition, diet is the sum of food consumed by a person or other organism.

The word diet often implies the use of specific intake of nutrition for or reasons (with the two often being related).

Although humans are omnivores, each culture and each person holds some food preferences or some food taboos.

This may be due to personal tastes or ethical reasons.

Individual dietary choices may be more or less healthy.