Weight loss injections such as those part of the hCG diet can lead to eating disorders and other serious health problems, according to Prevention. Side effects include headaches and depression. Blood clots may occur, which can be fatal.
As of 2015, doctors can legally prescribe the injections, which are touted as being capable of burning stored fat, but there is no evidence the injections promote weight loss, explains Prevention. The weight loss that dieters experience is likely due to reduced calories and the placebo effect.
The hCG diet limits calories to 500 per day, which is less than half the recommended calories by most nutritionists and medical doctors, states Prevention. Crash diets that severely restrict calories cause the body to use protein from vital organs such as the heart, increasing the risk of illness and death.