Healthy Diet : A healthy diet is one that helps maintain or improve overall health. A healthy diet provides the body with essential nutrition: fluid, macronutrients, micronutrients, and adequate calories. The most healthful diet involves eating a variety of nutrient dense foods from all major food groups. Learn about healthful diets and tips here at Glamour.Business. A healthy diet may contain fruits, vegetables, and whole grains, and includes little to no processed food and sweetened beverages. The requirements for a healthy diet can be met from a variety of plant-based and animal-based foods, although a non-animal source of vitamin B12 is needed for those following a vegan diet. Various nutrition guides are published by medical and governmental institutions to educate individuals on what they should be eating to be healthy. Nutrition facts labels are also mandatory in some countries to allow consumers to choose between foods based on the components relevant to health. The recurring theme across the diets that excelled in healthiness is adequate calories supplied by a heavy load of vegetables, fruits and whole grains; a modest amount of lean protein, nonfat dairy and healthy fats; and an occasional treat.