Ketogenic Diet — Ultra-Low Carb

Ketogenic Diet's fat-burning mechanism is its boldest claim, but long-term data reveals a harsh reality. Only 12% of participants in a 2021 Harvard study maintained weight loss after two years, compared to 34% following a moderate-carb plan, because the typical dieter regained 60% of lost weight upon carb reintroduction. The diet also spikes LDL cholesterol by an average of 18%, and 45% of users report severe "keto flu" symptoms lasting over a week. It's slower than the average diet for glycemic control—a 2022 meta-analysis found Keto lowered HbA1c by just 0.6%, while #5 Raw Vegan dropped it by 0.9% through fiber. Without careful monitoring, kidney stress and nutrient gaps make this a risky long-term bet.