How Quickly Will I Lose Weight If I Eat 800 Calories a Day?

By Staff WriterLast Updated Mar 30, 2020 10:23:11 PM ET

A person with a body-mass-index (BMI) over 30, can lose 3 to 5 pounds a week by eating 800 calories a day. This leads to a total weight loss of about 44 pounds if the diet plan is followed for 12 weeks, according to WebMD.