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So if that is the case all he needs to do to lose weight is to burn an additional 500 cals day and he'll be losing weight daily.
Again, it sounds good in theory but it's a totally different ball game in practice.
You're talking about a meagre 900-Cal diet with zero carbs. (Studies have shown that many obese people like Luther can't tolerate sugars & starches – blood sugar and weight shoot up). Blood sugar is borderline hypo, he'd be feeling faint most of the time. Most of his Cals would go to maintaining basic bodily and brain functions (the brain only functions on glucose). How much energy would a 200-lb man on very low-energy diet have left for sustained cardio exercise?
It's a double whammy when you have a very low BMR – you have to eat like a mouse, and you have no spare energy to exercise to burn off excess fat. That's why it's so difficult for genetically obese people to lose weight.
(By the way, an average 6'2" 220-lb man actually has a BMR of 2,100 Cals/day. Luther's way off the charts when it comes to BMR.)