Weight loss science is clear in principle but complex in practice. The fundamentals don't change regardless of which diet you follow.

The fundamental equation: A caloric deficit is necessary and sufficient for weight loss. 1 lb of fat ≈ 3,500 calories.

Why diets fail:

• Metabolic adaptation — body lowers BMR in response to calorie restriction
• Increased hunger hormones (ghrelin rises, leptin falls)
• Non-sustainable restriction leads to rebound
• Underestimating calories consumed (studies show people underestimate by 30–50%)

What actually works long-term:

• High protein diet — most satiating macronutrient, preserves muscle
• High fiber intake — slows digestion, increases fullness
• Minimizing ultra-processed food — engineered to override satiety
• Strength training — preserves muscle mass during deficit
• Sustainable caloric deficit (500 kcal/day = ~1 lb/week loss)

Reference:

Wikipedia: Weight loss

https://en.wikipedia.org/wiki/Weight_loss