You Need to Burn 7,000 Calories to Lose a Pound, Not 3,500

You’ve probably heard the number-one “rule” of weight loss: It takes a 3,500-calorie deficit between calories consumed and calories burned to produce a one-pound drop in body weight. This old chestnut is more than 50 years old. Problem is, it’s wrong.

Source: The Biggest Weight-Loss Myth Revealed

Is the reverse is true? Would it take more than 3,500 extra calories to equal a pound gained?