A structured eating plan developed by a Taiwanese nutrition expert is gaining attention for its potential to stabilise blood sugar, improve gut health, and even reverse chronic conditions like hypertension and sleep apnea. Known as the “35921 Diet,” the regimen helped its creator lose 17 kilograms in just four months while dramatically improving his metabolic health.
The method was devised by Hong Tai-Hsiung, a Taiwanese nutritional medicine specialist who turned to dietary science after his own health deteriorated. Burdened by a demanding work schedule and frequent social engagements, Hong developed obesity, high blood pressure, and sleep apnea. Determined to reclaim his health, he studied international metabolic balance theories and synthesised them into the “35921” principle. By applying the rules strictly, he not only shed 37 pounds but also effectively reversed his chronic ailments.
At the heart of the diet is a specific sequence for eating. Hong advises starting meals with protein and vegetables before touching carbohydrates. This order slows the digestion and absorption of carbs, helping to prevent sharp spikes in blood glucose. Protein also stimulates the release of satiety hormones, which curbs appetite and naturally reduces carbohydrate intake.
Breaking Down the 35921 Rules
The diet’s name encodes five core guidelines, each designed to optimise metabolism and blood sugar control.
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3: Three Meals a Day, on a Fixed Schedule
Hong emphasises that skipping meals disrupts metabolic function. When the body receives three proper meals, protein absorption reaches about 85 percent; eating only two meals drops that rate to 75 percent. Conversely, eating more than three times daily keeps blood sugar constantly elevated, robbing the body of opportunities to burn fat. -
5: Five-Hour Gaps Between Meals
Each meal takes roughly four to five hours for complete gastric digestion. Shorter intervals overload the digestive system, leading to impaired function over time. Longer gaps, however, trigger intense hunger that sabotages focus and productivity. Hong insists on no snacking between meals to preserve the body’s ability to burn fat efficiently. -
9: No Eating After 9 p.m.
Taiwanese dietitian Kao Min-Min explains that insulin secretion drops to its lowest point after 9 p.m., which is also when the body’s fat-burning efficiency peaks. Eating late interferes with this process. She further recommends sleeping before 10 p.m. to support hormone balance, particularly leptin and ghrelin, which regulate appetite. -
2: Two Litres of Water Daily
Proper hydration is critical. Hong suggests drinking 400 to 600 millilitres of warm water right after brushing teeth to lower blood viscosity and stimulate circulation. Another 400 to 600 millilitres should be consumed 30 minutes before each meal to prepare the digestive tract. Throughout the day, he advises sipping 200 to 300 millilitres every 1.5 to 2 hours to maintain fluid balance. -
1: One Serving of Fruit Per Meal
Each meal should include a fist-sized portion of fruit. Hong recommends consuming two to three types daily, with particular emphasis on guava, raspberries, and blackberries. These fruits are high in water and dietary fibre, supporting gut health and stable blood sugar.
Broader Implications and Expert Insight
While individual results vary, the 35921 Diet offers a clear, actionable framework for those managing diabetes or seeking weight loss. Nutrition experts note that its emphasis on meal timing, protein-first eating, and hydration aligns with established principles of glycaemic control. However, they caution that any major dietary shift, especially for individuals on diabetes medication, should be discussed with a healthcare provider.
Hong’s personal transformation serves as a compelling case study. From a place of illness and exhaustion, he rebuilt his health through disciplined eating—demonstrating that structured nutrition can be a powerful tool.
For readers looking to take the next step, exploring low-glycaemic foods, understanding the impact of sleep on metabolism, and learning about gut-friendly ingredients like high-fibre fruits can further support long-term health goals.