The amount of calories you need per day varies according to your gender, age and body weight, according to the American Heart Association. Eating significantly fewer calories than your body needs over a long period of time can seriously endanger your health.
Calories When Starving
The lowest recommended caloric intake for women and men is 1,200 and 1,500 calories, respectively. According to the National Institutes of Health's Medline Plus, a diet of 500 to 800 calories a day is dangerously too low and should not be done unless its a medically supervised diet.
Effects of Starving
Starving yourself has serious health consequences such as dehydration, constipation, malnutrition and electrolyte imbalances that can cause heart arrhythmias and death, according to Health Tree.
Safe Weight Loss
Reducing your daily calorie intake by 500 to 1,000 will result in a safe weight loss of 1 to 2 lbs. per week. Combining increased physical activity with reduced food intake can help you lose weight without depriving your body of nutrients and calories.