aarondb4 wrote:
You mentioned 1,500-2,000 calories per day. How did you arrive at that number for weight loss? Is that just based on your experience of what you need personally? Or is there some method you use.
Yes that's a very good question. In this whole calorie deficit equation there are some elements that are pretty accurate and others that are not so accurate. So I start with the accurate things and then fine tune based on the not-so-accurate things.
I begin with my RMR (resting metabolic rate). I tested mine using indirect calorimetry (a metabolic cart) but the answer it gave is actually pretty close to some of the estimates you get from online calculators.
RMR: 2200 calories per day. That's how much I will burn if I do nothing.
Then, you would normally add some calories on top of that based on how active your lifestyle is. At this point, I add ZERO, because when I'm not working out, I'm not doing much physical activity. If I was a construction worker or someone who really did move a lot I would add some calories here. But in MFP I choose whatever that most lazy option is.
Then, I deduct calories based on what I want to lose. For me, I think I went for about a 500 calorie deficit per day, so my target is about 1700 calories.
There is actually quite a good mathematically based
formula online, that is more sophisticated than the "lose 1 lb of fat for every 3500 in deficit" principle, and it will account for your RMR decreasing as you lose weight, but I just wanted to keep it simple, since with the inaccuracies in both food eaten and exercise calories burned, I didn't really feel it was worth complicating.
After that, I track the calories consumed, using MFP, and I track calories burned using Training Peaks. The training peaks numbers are actually very accurate for me (validated by testing with an actual metabolic cart), so I trust those a lot more than those default calorie estimates you get in MFP (those are over estimated quite a bit).
So with all of that together, I'm aiming for net calories per day of 1700. On most days that means eating 2500-3000 calories. I track it all super diligently for 2 weeks and then see what the weight loss is. Then I adjust the number based on what actually happens.
I also track calories during my key build phase of training, but with the goal of making sure I'm slightly over my caloric intake (i.e. slight surplus) which makes sure I have enough energy to recover well etc. So in those cases I'm shooting for closer to 3000 net calories per day, and if I start gaining weight I reduce it a bit.
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