1. Why Crash Deficits Backfire
When you cut calories too aggressively (losing faster than ~1% of your body weight per week or dropping below 1,200 kcal for women / 1,500 kcal for men), lean muscle loss accelerates, non-exercise activity (NEAT fidgeting and steps) subconsciously plummets, and hunger hormones surge.
2. Strategic Maintenance Diet Breaks
In the landmark MATADOR trial (Byrne et al., 2018), participants who alternated dieting blocks with planned 2-week maintenance calorie blocks lost more fat and preserved resting energy expenditure better than continuous dieters over the same active dieting weeks.