https://www.health.harvard.edu/topics/diet-and-weight-loss

https://www.ncbi.nlm.nih.gov/books/NBK221839/

https://www.mayoclinic.org/healthy-lifestyle/weight-loss/in-depth/weight-loss/art-20047752

https://www.hopkinsmedicine.org/health/wellness-and-prevention/8-ways-to-lose-belly-fat-and-live-a-healthier-life