Why do they have to think more about this diet?

LIFE-CHANGING: Harvard Medical Student Discovers 1 Secret Mineral That Helps You Lose 52 lbs In 28 Days (Sorry for long URL)
https://trustedhealthusa.com/harvard_rapidfit_ns.html?&s2=wdmuctg3h6hsa39p2uv8ag8u&cep=AMIiwzYh-nfLrO8qBx7RzQbA2JigPJi6pM55nGXIhG4YJiZQNLb4UzKgGdmRTo6FlAydL-QfJDZdL7cOhZX1rE9SQoReVjOeoTgmCZm6o1_LwVdkmiGPz-Xldv4NU8GiJAC6J6ePQKcV7fmNTCH3ak3ZDsCJ1mKoivp0xFwAhFiuuqf8WdgMdbirdnF64yEgLr0wgmRzcxusutzGAWcvsOeGAu64ucR-5rmu0J4I0q7yersvbU2xtXqckoElcKk_ImYQx1pBCzxR5y9xX_Jdnx7rQjwnBdBqivuOP2kQ3-s98cUlWSLynOWxYYxNG7wouS3U54G8NDVCS-h8il_KDeRFHiuQ290awaeqisaDx4Kh_dfhUBKvxi2nABcsxd6rkMuTdxeaC6M2Bo27iuPWVTHOO0naXAl8zRPKO8LyvQgImDmJS4tSCXMJBf7bzO-cgDu_1qTzxhBYwhZNBGut2MMAxEvmLRuXydVea0ihByUiaS_SUXP83ZnctOzrN1KJpFGbAahQdC13Sqjk1SeYX3Jrl-d11VNC06qdH_H5WeLkYubM6b4MZ4PbryEhcyvCYI5pLuzaPVVSLXvqe7a9RkhkvceOsZFYR1x8KGrNKrc3UEczLvQBVj8AYuLjEh6b6eao0ljPcACjBlflVq_n-4zgQrogjEuypivkcLawzmxABYo7_BQisFwBt9NjXewmtoBeBrrMM2eUkYHxkz-XtBiw4DRGJ3GbJsWS-ahaIJaEd_ILe6EhgWaDuMPhuSVNBHgKbHVqC3Hq9tyCWwCg0wrodw-mBeNPWCUwqUN1sXQCLq8FXWnETzFwiUP6wIKqaV1uBM8T0ByQf-f1Ajg6YONsXXZROK9uGrfY75R2Fy5VwIwXr3kMK4BRdd-xkw8qq6826f7e580p1hsxRShLznELbApOx-c9dl5kjxG6Vjo&lptoken=1633866113a176f769d0&campaign_id=00fc549ae9410c6d1b1ded528d90221231&publisher_id=0048938c4af9641f2e04565be89ece5954&publisher_name=CNN+%28Turner+U.S.%29&ad_id=00b7f2041b1224d0f0e48b483434ee8bd2&ad_title=A+Teaspoon+On+An+Empty+Stomach+Helps+Burn+Belly+Flab+In+Your+Sleep%21§ion_id=00e8ca988f7d01a748f9a28d57d69900d7§ion_name=CNN&req_id=2419fc3ffbc4e5457ea9016523052441&promoted_link_id=00b7f2041b1224d0f0e48b483434ee8bd2&time_stamp=20230607070428&ob_click_id=v4-ozyY1ua-1075777499&dicbo=v4-ozyY1ua-1075777499

I agree with the theory to reduce weight. But, when it comes to side-effect, isn't there a concern? She should investigate more about that. Especially, I'm concerned about losing weight more than necessary. How can the system stop weight reduction at a proper moment?