Losing weight fast can be very risky to a person's health and attempting to lose a large amount of weight without first consulting a physician for a personalized weight loss plan is not recommended. The key factors in immediate weight loss, according to Mayo Clinic, are a considerably reduced daily caloric intake and regular exercise that burns at least 500 calories per day.
Losing weight quickly is possible through moderated eating and regular exercise, but to maintain the weight loss and keep it off, dieting is not the answer. A lifestyle change is the only tried and true method. Though advertisers for diet products promise a slender figure in a short period of time, no diet supplement has been proven to work, as stated at WebMD. The FDA does not regulate over-the-counter weight loss products, and the use of them leaves the consumer risking his own health.
Even when applying a lower-calorie diet and a regimen of regular exercise, it is best to be cautious about losing too much weight too quickly. WebMD points out that many health issues can arise, including malnutrition, dehydration, hair loss, muscle loss, dizziness, fatigue, headaches, electrolyte imbalance, constipation, menstrual irregularities, gallstones and irritability.
Mayo Clinic has a quick start diet that it designed and recommends, but it segues after the initial two weeks of high weight loss into a regulated weight maintenance program that continues to shed pounds at a slower, healthier rate.