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People who are moderately to severely overweight can derive substantial health benefits from a weight-loss diet. A weight reduction of just 10–20 (4.5–9.1 kg) can result in reduced cholesterol levels and lower blood pressure. Weight-related health problems include heart disease, diabetes, high blood pressure, and high levels of blood sugar and cholesterol.
In individuals who are not overweight, dietary changes may also be useful in the prevention or treatment of a range of ailments including acquired immunodeficiency syndrome (AIDS), cancer, osteoporosis, inflammatory bowel disease, chronic pulmonary disease,
renal disease, Parkinson's disease, seizure disorders, and food allergies and intolerances.
— David Helwig
