I've heard that a tofu diet is great for losing weight. How exactly does it work to help with weight loss?

From a modern nutritional perspective, tofu is essentially a powerhouse of protein and fiber. Because protein takes longer to digest than carbohydrates, it keeps you full longer and helps suppress the 'fake hunger' that leads to snacking. More importantly, it prevents rapid spikes in blood sugar, thereby inhibiting the over-secretion of insulin, the hormone that promotes fat storage. In Traditional Korean Medicine (TKM), this is understood as a process of tonifying 'Spleen Qi' (脾氣). In a state of 'Spleen Deficiency' (脾虛), the digestive system's energy weakens, leading to the accumulation of metabolic byproducts known as 'Phlegm-rheum' (痰飮). These toxins are often the root cause of a constitution that struggles to lose weight. Tofu helps resolve this Phlegm and promotes urination, which is excellent for reducing edema (swelling). However, one should be mindful of tofu's 'cool' nature. For those who frequently experience a cold abdomen or weak digestion, consuming too much cold tofu can actually obstruct the 'Circulation of Qi and Blood' (氣血 循環). To achieve a healthy and sustainable diet, it is recommended to cook tofu warm to support your body’s internal balance and circulation.