The Yo-yo Effect and Health Consequences of Extreme Dieting Trends
Discover the health risks of extreme dieting and the mechanisms behind the yo-yo effect that makes weight management difficult.
Extreme dieting involves rigorous energy management techniques, focusing on extreme calorie reduction or the complete elimination of essential food groups. While promising rapid weight loss, these methods often lack scientific basis and pose serious risks of nutritional deficiencies.
Common forms include water-only fasts, ultra-low-calorie diets, or mono-diets focusing on a single food item (such as meat or potatoes). These methods share a common trait of excessive energy deficits—often exceeding 500 kcal below daily requirements—leading to metabolic imbalances.
According to Associate Professor Dr. Nguyen Thi Lam, former Deputy Director of the National Institute of Nutrition: 'For basal metabolic needs, women require 1,200 kcal/day and men require approximately 1,400 - 1,500 kcal/day. For those engaged in heavy labor, this figure must exceed 2,000 kcal to maintain biological functions.'
Beyond pathological risks, the yo-yo effect is a primary reason for the failure of these diets. Research from the University of Campinas (UNICAMP) warns that the cycle of repeated weight loss and gain impairs brown adipose tissue (BAT) activity, causing the body to accumulate more visceral fat rather than burning energy efficiently.
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Brown fat plays a vital role in improving glucose and lipid metabolism, protecting the body against diabetes and cardiovascular disease. Focusing solely on scale numbers while ignoring muscle mass and body composition quality is a misguided approach.
Instead of pursuing unscientific trends, consumers should establish a balanced diet and consult with nutritionists to develop a sustainable, safe weight management plan.
