fasting isn't great to lose weight your body needs food if anything do the heart smart diet (soup) it is safe and doctor approved ( they made it up for overweight people who needed to lose weight fast for heart surgery)...but fasting isn't the answer
I appreciate your concerns. I had the same misgivings before I tried it myself and realised humans have adaoted over millenia to a feast or famine environment and can go long periods without food. I regularly fasted for several years and found it benefited me health wise, weight wise and spiritually. There are reasons all major religions promote fasting. I lost the benefits when I went back to old bad habits. Now I have made lifestyle changes I think the benefits will stick. There are a lot of writings on the therapeutic benefits of fasting. The three meals a day habit is only 200 years old.