Nutrient deficiencies : severe diet restriction leads to many nutrient deficiencies such as carbohydrates , proteins ,vitamin A ,vitamin D, VITAMIN E, vitamin K and mineral like calcium , phosphorus sodium etc. these are essential food groups and their absence in the diet can be the cause of numerous deficiency diseases
Slow metabolism : the slow metabolism dieting consists of a drastic decrease in calories intake. it leads to slow metabolism in body . slow metabolism leads to a slow weight loss with body fat level but less muscle
Altered mood : When our body is not getting sufficient nutrients, it affects our mood because of hormonal changes and lowers the level of blood sugar. When body is slow on energy, we feel tired very easily and can be in bad mood which is not good for the health
Headache: another side effect of unsafe, rapid weight loss are frequent headaches. So, it is advised that one should always eat a regular meal, drink plenty of water before and after exercise to avoid headaches
Constipation: the state of having irregular bowel movements is very common with severe dieting . We should increase the fiber intake in such cases as Green leafy vegetables , fruits and increase the amount of water which is very effective in this condition
Gallstone: it is a very serious side effect of low calorie diet. When the body loses weight too quickly, the liver starts secreting extra cholesterol in the bile which leads to gallstone in the upper abdomen, back and can also cause symptoms such as nausea ,vomiting ,bloating, heart burn etc
Menstrual cycle: severe dieting may lead to rapid weight loss that can force the female body to start shutting down all the non essential survival function. It can adversely affect the menstrual cycle also.