Or we could get some facts...
http://www.webmd.com/diet/low-calorie-diets#1-2
Are Very Low-Calorie Diets Safe?
Very low-calorie diets are not OK for everyone. Talk to your doctor to see if this kind of diet is appropriate for you.
If your BMI is greater than 30, then very low-calorie diets are generally safe when used under proper medical supervision. For people who are
overweight but not obese (BMI of 27-30), very low-calorie diets should be reserved for those who have weight-related medical problems and are under medical supervision.
Very low-calorie-diets are not recommended for
pregnant or
breastfeeding women, and are not appropriate for children or
teensexcept in specialized treatment programs. They also may not be OK for people over age 50, either, depending on the potential need for
medications for pre-existing conditions, as well as the possibility of side effects.
What Are the Side Effects of Very Low-Calorie Diets?
People on a very low-calorie diet for 4 to 16 weeks report minor side effects such as
fatigue,
constipation,
nausea, and
diarrhea. These conditions usually improve within a few weeks and rarely prevent people from completing the program.
Gallstones are the most common serious side effect of very low-calorie diets. Gallstones are more common during
rapid weight loss. When the body experiences a calorie deficit, it starts to break down fat for energy. The
liver then secretes more
cholesterol and when combined with bile, can form gallstones.