1 lb = 3500 calories
WEIGHT LOSS
A person must remove or burn 3500 calories over a period of time. For example, reducing calories by 300 per day and increasing daily activity to burn off an additional 200 calories should result in a weight loss of one pound per week.
500 cal x 7 days = 3500 calories
WEIGHT GAIN
One must add 500 calories per day without adding any additional activity. For example, a peanut butter (low fat) and jelly sandwich on wheat bread with 8oz of 2% milk is approximately 500 calories.
500 cal x 7 days = 3500 calories
WEIGHT MAINTENANCE
Most people leading a moderately active lifestyle need about 15 calories per pound to maintain their weight. For example, a person weighing 150 pounds would have to consume no more than 2250 calories each day to maintain their weight.
15 cal x 150 lbs = 2250 calories