Doctor, why am I always told to eat mostly vegetables when dieting? I'm curious about the exact principle behind it.
In simple terms, the abundant dietary fiber in vegetables slows down the absorption of sugars, preventing sudden spikes in insulin. This creates a chain reaction: [fiber intake → moderated blood glucose rise → optimized insulin secretion → inhibition of fat accumulation]. It is not merely about low calories, but about stabilizing your hormonal system to make weight management much more effective.
I remember a time when I was overly ambitious and stuck to a strict chicken-breast-only diet; I quickly burnt out and felt lightheaded. Through that experience, I realized the core of the matter is blood glucose management and digestive efficiency.
From a Western medical perspective, dietary fiber acts like a net in the intestines, slowing the rate at which carbohydrates convert into sugar and enter the bloodstream. This prevents the over-secretion of insulin, the primary fat-storage hormone, keeping the body in a state where it is less prone to gaining weight.
In Traditional Korean Medicine (TKM), we interpret this through the concept of 'Dameum' (痰飮), which refers to stagnant, unnecessary metabolic waste in the body. A lack of dietary fiber leads to intestinal stagnation, making it easier for Dameum to accumulate. However, for those with 'Bi-heo' (脾虛)—a deficiency in Spleen function—raw vegetables can actually cause bloating and indigestion due to weakened digestive capacity.
This is why I don't simply tell patients to 'only eat greens.' Depending on your constitution, you may need lightly steamed vegetables or ingredients with warm properties. Assessing your digestive strength and current metabolic state is the first step toward a diet without the yo-yo effect. Let's visit the clinic to determine which specific vegetables are best suited for your unique body type.
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