The Link Between Obesity and Life ExpectancySome researchers have determined that, in those who are extremely obese, life expectancy may be reduced by an estimated five to 20 years.
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The heavier person can create a bigger calorie deficit than the lighter person. The 300-pound person could reduce calorie intake to 1500 calories per day, resulting in a calorie deficit of 1000 calories a day or about 2 pounds lost per week.