每天热量800卡以下的减肥多半是需要在医生指导监护之下，并且是在人极度超重、生命健康受到极端威胁下的情况才会采用的。
正常人每天的基础代谢也有1200卡，更不要提日常活动外加有氧无氧运动了。 偶尔一天几天没有足够的食物对身体没什么大碍，长期这样极端的节食（800卡以下）对身体是有损害的。 国内的妹妹们好多都是这样减肥的，去减肥论坛随便逛上一逛，就看得到大把这样的故事与后果。
年轻的时候，健康的时候，觉得自己做什么都可以，怎么做都行，我也是那个时候过来的。年轻的时候恢复的快，而且有些伤害是累积的，等人到中年，再不注意保养，就没那么好恢复了。
身体是自己的，宠爱自己不只是一句空洞的口号而已，与JM们共勉。
Side Effects of a Very Low Calorie Diet
A very low calorie diet, or VLCD, is often used under medical supervision to help people who suffer from obesity lose weight more rapidly than the recommended weight loss of one to two pounds per week. Usually, people consuming a VLCD eat less than 800 calories each day. The structure of a VLCD is extremely strict and may include liquid shakes and bars, which are nutrient dense, to ensure that the dieter is still getting his recommended levels of vitamins and minerals.
A very low calorie diet is not recommended for everyone. A VLCD is reserved for those with a body mass index, or BMI, of greater than 30, which is considered obese. To put it into perspective, if you are at a healthy body weight, you have a BMI of 18.5 to 24.9. VLCDs can be dangerous for those who are pregnant or breastfeeding; children, teens and those over 50 years of age; or those with some preexisting medical conditions. Before a VLCD is prescribed, each patient is evaluated on a case-by-case basis to determine if a VLCD is a safe option for weight loss. Side Effects of a VLCD Patients who are following VLCDs often complain of fatigue, constipation, nausea and diarrhea. A VLCD can also increase the risk of experiencing more serious side effects. The most common serious side effect is the formation of gallstones, which are more common in women who are experiencing rapid weight loss. When adolescents or children consume a VLCD, their growth and development may be in jeopardy. It is extremely important that those who attempt a VLCD to lose weight are under the care of a medical professional in case any side effects present themselves. VLCD Long-Term Success A VLCD may allow a dieter to lose three to five pounds per week. Positive results can improve some medical conditions, such as diabetes, high blood pressure and high cholesterol. However, many dieters who have completed a VLCD end up experiencing weight regain. If you attempt a VLCD, use the counsel of medical professionals to work on changing your eating and lifestyle behaviors permanently. Behavior therapy, regular physical activity and follow-up treatment are strongly recommended after a VLCD is completed to improve the odds of long-term success. Beware of VLCD Fad Diets Many fad diets on the market today, such as the grapefruit diet, promote a drastically reduced caloric intake. With many of these diets, the most common cause of weight loss is the reduction of water weight, which is immediately regained after the diet is over. Many of these diets also have strict eating plans that many times eliminate entire food groups from being consumed. A dieter attempting a VLCD may be severely restricting some or most of the essential nutrients needed to maintain good health. ReferencesCandidates for a VLCD
Read more: http://www.livestrong.com/article/396404-side-effects-of-a-very-low-calorie-diet/#ixzz25nxncK82
