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But we still have to take into account the BMR (Body Metabolic Rate). Every male and female shouldn't take less than 2200 calories daily as it will decrease the body metabolism rate.
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Nope. You're using a one-size-fits-all model, which doesn't work. Heck, some people don't even HAVE a 2200 calorie BMR - with your recommendation, those people would GAIN weight.
Yes, you can drop your metabolism and stall out your
weight loss by dropping your
calories too fast, so it's a good idea to not drop your
calories any more than necessary to get a good result. I agree with that. But you can't link that to a particular figure, because each person is different.
A reasonable approach to losing weight is figuring what your maintenance level of
calories is (and that's NOT the same as your BMR) and then dropping that by 20% or 30%. The larger you are, the more you can safely drop that figure - some extremely obese people *can* drop by 50% - but ideally even if you are extremely obese, you still would only drop by 20% - 30%.
Why is that? I think Alan Aragorn said it best in one of his podcasts (paraphrased here): The idea is to get the best results with the least amount of pain and effort. It's human nature to give up if something is too hard. The more difficult you make the effort, the more restrictive, the more painful ... the less likely that someone is going to stick with it all the way through.
The Harris-Benedict formula is pretty much the standard for figuring out BMR and then figuring out maintenance
calories on top of that. But you can get a pretty close estimate by taking an average figure of between 13-15
calories per
pound of bodyweight (assuming someone who is moderately active).
For example, I'm 5'4" and 167 lbs. My figures using the H-B calculation give my BMR at 1717 and my maintenance at 2403
calories. Using the multiplier above (15 cals per
pound of bodyweight) I get 2505
calories to maintain my current weight. Pretty spot on, I'd say.
So either way, if I take those figures and subtract 30%, I get around 1700
calories a day (1683 using H-B and 1753 using the multiplier). Average that out to 1700 and it's pretty darned close.
But based on what you said above, that I shouldn't go below 2200 - I'd never lose weight.
Then, on top of that, the way to make sure your metabolism stays raised is to include exercise in your
weight loss routine - and not just
cardio, but the type of exercise that maintains lean muscle. That means lifting
weights and/or doing
body weight
exercises.
Maintaining lean muscle means you're maintaining metabolically active tissue - muscle is far more active than any other
body tissue. So you want to make sure that you do everything possible to keep/grow muscle (by eating more protein, by doing the types of
exercises that build strength) while losing
fat.
Hope that helps.