This isn’t completely true…

https://www.taxpolicycenter.org/taxvox/who-gets-tax-benefit-those-checkout-donations-0

https://www.usatoday.com/story/news/factcheck/2021/06/10/fact-check-false-claim-checkout-charities-offset-corporate-taxes/7622379002/

https://www.snopes.com/fact-check/walmart-checkout-charity/

I’d be cautious stating that these videos represent science. People are free to make their own dietary choices of course, but ‘water fasting’ and ‘low-carbohydrate high-fat’ diets are questionable. Also, FYI, Dr. Jason Fung is a Kidney doctor.