Protein supplements are certainly efficient; they prevent muscle loss and serve as a great alternative for busy professionals who find it difficult to prepare meat-based meals. However, from a Traditional Korean Medicine (TKM) perspective, if an individual with Spleen Deficiency (脾虛, bi-heo)—meaning a weak digestive system—consumes high-concentration protein, it can fail to be processed and instead turn into 'Phlegm-fluid' (痰飮, dam-eum). This is a type of non-physiological metabolic waste that causes the body to feel heavy and swollen, defeating the purpose of the diet. Additionally, artificial sweeteners in these products can disrupt the gut microbiome. Therefore, I recommend plant-based proteins or whole foods for those with weak digestion or constipation. Conversely, individuals with a robust build and significant internal heat may handle animal-based proteins like whey more effectively. The most important thing is to listen to your body: if a product makes you feel bloated or heavy, that is a clear signal from your digestive system that it is not the right fit for your constitution.