Research
Mixed
Weight loss triggers physiological adaptations (increased appetite, decreased energy expenditure) and behavioral shifts (declining adherence) that create a biological pressure to regain lost weight, making maintenance significantly harder than initial loss.
Expect your body to fight back after you lose weight. This is biology, not failure. To maintain weight, you must actively counter these drives with specific strategies (like increased physical activity or dietary adjustments) rather than relying on the same level of effort used to lose the weight. Focus on adherence-supporting behaviors.
StrongSupportsHIGH confidence
In response to the decreased energy stores and negative energy balance, there is a coordinated decrease in energy expenditure (biology) and increase in responsivity to food-related cues (behavior)... These adaptive responses are designed to prevent continual weight loss but they also create the biological pressure to return the body to its original weight.
Why this rating
Based on a consensus of an NIH working group of experts reviewing decades of research.
Source
NIH working group report: Innovative research to improve maintenance of weight loss
Paul S. MacLean et al. · Obesity · 2014
DOI 10.1002/oby.20967
narrative_reviewCited 559×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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