Why This Works

This page is optional. If you just want the rules and you trust that they work, skip this and go use them. But if you're the type who needs to understand why something works before you'll actually commit to it, this one's for you.

Why the Deficit Shrinks: It's Not Just "Less Body to Feed"

Some of the shrinking deficit is simple and obvious — a smaller body needs fewer calories to maintain itself, the same way a smaller house costs less to heat. That part's just math.

But there's a second piece that surprised me when I learned about it: your body can also dial its own engine down. As fat stores shrink, a hormone called leptin drops, and falling leptin tells your brain to quietly throttle a few things — how much you fidget and move without thinking about it (called NEAT — non-exercise activity thermogenesis), how efficiently your thyroid converts into its active form, even how hard your nervous system is firing. None of that shows up as a decision you make. It just happens, in the background, as a survival response to sustained deficit.

I'm not a scientist, and I don't need to fully understand the biochemistry to work around it. I just need to know it's happening so I don't panic when the scale slows down and assume I'm doing something wrong. I'm not — my body is just doing exactly what bodies do under sustained deficit.

On the flip-side, muscle tissue burns more at rest than fat tissue does, pound for pound. Not a massive amount per pound, but it adds up. So if the gym work is actually building or holding onto muscle and I'm losing fat — my body is heating up metabolically and burning more calories just existing.

That's the tug-of-war happening underneath the surface the whole time. My body is trying to throttle down (the leptin/NEAT side), and my training is actively fighting back (the muscle side). So far, deep into this, they've roughly balanced out — which is exactly why my weekly loss rate hasn't visibly decayed the way the textbook expects it to by this point. That's not luck, that's the "eat less, move more" working exactly as designed.