If you lose weight by reducing calories--a diet, bariatric procedure, or pharmaceutical like a GLP-1 agonist--you will indeed lose weight at first. But long-term, unhealthy changes in health will develop: eventual weight regain, increased risk for heart disease, type 2 diabetes, dementia, frailty. And thare are now sufficient data to tell us that you also cut your life short by several years. 

The key: NEVER engage in any of these methods. If you have, there are steps you can take to compensate and specifically target the most unhealthy forms of body fat, restore youthful muscle, restore basal metabolic rate and thereby absolve yourself of these unhealthy outcomes. 

You can find a full discussion of these strategies in my new Super Body book:
https://www.amazon.com/SUPER-Body-Composition-Youthful-Contours/dp/0306835991

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YouTube channel: https://www.youtube.com/@WilliamDavisMD

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Books:

Super Gut: The 4-Week Plan to Reprogram Your Microbiome, Restore Health, and Lose Weight

Wheat Belly: Lose the Wheat, Lose the Weight and Find Your Path Back to Health; revised & expanded ed