Reducing diet is a popular term used to describe a diet aimed at reducing weight or body size. However, there are several synonyms that can be used instead of "reducing diet." One such synonym is "weight loss diet," which specifically targets losing weight in a healthy way. "Low-calorie diet" is another synonym, which focuses on reducing calorie intake to aid weight loss. "Slimming diet" is often used in the context of products that specifically help with slimming or weight loss. "Healthy eating plan" can also be used as a synonym, which emphasizes eating nutrient-rich foods in the right amounts to achieve weight loss or body size reduction. Regardless of the term used, the key is to focus on healthy eating habits and lifestyle changes to achieve long-term sustainable results.