If you know someone that struggles with this, it could literally save a life! Diet yields a decrease in (BFP) body fat percentage, not exercise. Excercise will help strengthen and build muscle. Also BMI (body mass index) is almost complete nonsense.
More resources:
- https://www.drberry.com
- https://thesaifhouse.com/fiatfoodsample
- https://beefinitiative.com