I'm told to eat only chicken breast and cabbage. Why does this specific diet help with weight loss?

Biologically, this diet is efficient for burning body fat by preventing blood sugar spikes and stabilizing insulin secretion. However, we often overlook the crucial factor of 'digestive capacity.' In Traditional Korean Medicine, a struggle with this diet is often viewed as Spleen Deficiency (Bi-heo, 脾虛), where the digestive and absorptive functions of the Spleen are weakened. When digestive power drops, food is not efficiently converted into energy and instead leaves behind metabolic waste known as Phlegm-Fluid (Dam-eum, 痰飮). Specifically, since cabbage has a 'cool' nature and chicken breast can be dry and hard to digest, those with Spleen Deficiency may experience bloating, lethargy, and a significant drop in energy. This can eventually slow down the overall metabolism, risking a transition into a constitution where you gain weight even while eating very little. Ultimately, the most important factor is not just 'what you eat,' but whether 'your body is prepared to digest it.' You must adjust your diet to match your digestive state to manage weight healthily and prevent the yo-yo effect.