Weight Loss and Weight Management Diet Market Size Was Valued at USD 312.76 Billion in 2023, and is Projected to Reach USD 757.01 Billion by 2032, Growing at a CAGR of 10.32% From 2024-2032. Weight loss and weight management diets are the planned diets that provide guidelines for the selection and use of foods in an attempt to reduce body weight or to prevent weight gain.