Let me just start this off by saying that I am NOT an expert on anything I'm about to discuss, but I do know from personal experience that it works. Hopefully no one takes offense to this.
When first signing up for MFP, it asks you how many pounds you want to lose per week, what your goal is, what you daily goals should be, ect. I know for me, originally, based on MFP's estimates, it was recommended that I consume and net 1200 calories for the fastest weight loss possible. The very next day I began very strictly watching what I was eating and keeping my net around 1200 calories or less depending on my exercise. However, I soon realized that I was kind of cranky and a bit hungry throughout the day, but I figured it just meant that my body was adjusting to the amount of food that I was eating, after all, I didn't get to my highest weight ever by eating proper portion sizes!
Lo and behold, I come across a whole bunch of people saying that I should be looking up my BMR and eating around there. Since I always need to know about anything, I Googled it, of course. I ended up coming across
this website and my calculated BMR is around 1700 calories per day. Now, I'm no expert, but I believe that means that as long as my activity level stays the same, that is roughly how many calories my body uses up, per day, purely by existing.
Now that just so happens to conflict with the number previously suggested to me by MFP, so I asked around to my friends on MFP and I couldn't find a single one that had tried it and had negative effects as a result, so I figured why not. I set my calorie goal to be around 1550, because apparently it's okay to eat a few hundred (200-300) calories below whatever your BMR is to speed up weight loss. Since then, I've pretty much continuously lost weight, regardless of going to the gym or not. (Going to the gym just helps, and I can eat a little more on days that I do go.)
I guess the concept behind it is that although 1200 calories is what your body needs to stay out of "starvation mode," at that mark, it's kind of difficult to eat exactly 1200 calories per day, and there's still a huge debate as to whether people should eat back exercise calories or not (whatever, another day for my opinion, I suppose). SO BASICALLY, it's a pain in the butt to eat that little each day. If you click "complete entry" with 1199 calories in your diary for the day, MFP will alert you that you are eating too little and that it would be best for you to eat more, so I think it's fair to say that maintaining ONE more calorie per day is NOT the magic number.
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I know, I know, this was a bit of a rant, but I've recently told people in my real life about what I've been working towards (now that it's becoming more obvious) and I've ended up finding out that a few people I know in real life have MFP accounts and they are eating at/usually BELOW 1200 calories per day! Yeah, they've lost 5-10lbs maybe, but I can't seem to explain to them that it's not good to be doing that. I know I'm no expert, but I really want to help. I think I do happen to at least know something if I can manage to lose 22 lbs to date in 3 months, and pretty much keep it off (if I didn't want to lose plenty more still, that is).
Sometimes, I wish people would just listen to advice, but I know that sometimes it's best to let them learn on their own. It's just really difficult to do when you know it's going to hurt them in the long run. :/