Dietary tips for mental well being can greatly aid to enhance the performance of immune, digestive, gastrointestinal, cardiovascular and nervous system, endocrine, immune and nervous system. Studies have demonstrated that poor mental health is often linked with poor dietary quality regardless of age, sex, education, marital status, income level and ethnicity. However, obesity and lack of physical activity are commonly associated with poorer mental health. The association between diet quality and mental disorders is unclear but patients with depression and other mood disorders have been found to have poorer eating habits and less active lifestyles than those with non-depression disorders.

Diverse studies of dietary tips for healthy eating have revealed that a healthier diet can promote better overall health by decreasing the risk for chronic diseases such as diabetes and heart problems, while maintaining or improving nutrient intake, blood pressure, cholesterol and obesity risk. Additionally, a healthier diet can decrease the intake of saturated fat, salt and sugar which are proven to contribute to increased blood pressure and cholesterol levels, while reducing the intake of non-nutritional foods that are linked to a number of chronic diseases. The optimal dietary intake of vitamins, minerals, carbohydrates, proteins and fibre are critical in maintaining a healthy weight, body mass index, cholesterol level and general health.

The CANSA body mass index, which is used in clinical trials of various cancer treatments, is a tool that is used to ascertain the ideal dietary guidelines for patients with suspected cancer. An index such as the CANSA provides a guide that can be used to determine what a person should eat to achieve a specific body mass index. For example, according to the Canadian Cancer Society, a slightly heavier body mass index could be useful to patients who are at high risk for cancer, but whose risks for other life threatening diseases are not yet known. The CANSA provides support for the use of healthy eating guidelines and encourages individuals to adopt a healthy lifestyle by adopting a balanced diet and regular physical activity.