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Wednesday, 17/12/2025 | 12:01 GMT+7

Why do you still gain weight using diet sugar?

I regularly use diet sugar and sugar-free soft drinks, but why am I still gaining weight? (Ngoc Huong, Ca Mau)

Answer:

Many individuals opt for diet sugar or sugar-free beverages in their weight loss regimens, believing these products lack carbohydrates (carbs). This belief, however, is incorrect. Sugar substitutes, though not real sugar and carb-free, can negatively affect the gut microbiome with long-term use, potentially hindering weight loss efforts.

Relying on diet sugar in cooking and beverages while still consuming excessive starches, processed foods, and fast food can lead to significant fat accumulation, resulting in rapid weight gain rather than loss. Furthermore, prolonged consumption of sugar substitutes can induce biochemical alterations in fat and amino acid metabolism, elevating the risk of type 2 diabetes and obesity. The intense sweetness of diet sugar might also heighten cravings for sweets, prompting overeating and subsequent weight regain.

Using sugar substitutes does not lead to long-term weight loss. Illustration created by AI

You should prioritize healthy eating by reducing your overall sugar intake and limiting sweets, rather than relying on diet sugar. Sugar substitutes are not essential dietary components and provide no nutritional value.

Ultimately, diet sugar offers no lasting weight loss benefits and may even be counterproductive, increasing your cravings. For scientific and safe weight loss guidance, it is advisable to consult a weight management or nutrition specialist.

Master, Doctor Hoang Thi Hong Linh

Department of Endocrinology and Diabetes

Tam Anh General Hospital, TP HCM

Readers can submit questions about endocrine diseases here for a doctor's response.
By VnExpress: https://vnexpress.net/tai-sao-dung-duong-an-kieng-van-tang-can-4994872.html
Tags: diet sugar weight loss overweight sugar

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