The Chart

It Takes A Long Time To Change Your Body

Stephen Strong, M.D. · September 2026

Let's say you're carrying extra fat, feel weak, and don't have much muscle mass.

It can take up to a year to build 5 to 10 lbs of muscle. It can take many months to lose 10 or more lbs of body fat. And the last thing you want is to do it quickly, because moving fast is how you lose the skeletal muscle we've been talking about.

I want to put real numbers on this, because I think the timeline is the single most misunderstood thing in this entire subject.

Every 10 lbs of fat you want to lose is roughly 35,000 calories. Say you work out your daily caloric requirements and land on a deficit of 300 to 400 calories a day. At that rate, 10 lbs takes you a little over three months — and realistically longer, because your energy expenditure drops as you get smaller, so the arithmetic quietly works against you the whole way down.

Three-plus months. For ten pounds. While training. That's what the process actually looks like when it's working.

Remember that you are literally exhaling this. It leaves your body a breath at a time.

Pick a direction and stay in it

Here's what I see constantly: someone builds muscle one week and diets the next. They eat more for four days because they trained hard, then panic and cut for three days because the scale moved. Over six months they've done both things badly and neither thing well, and they conclude their metabolism is broken.

Their metabolism is fine. They never actually ran one strategy long enough to find out if it worked.

So do this instead. Find out where you're starting — your current weight and, more importantly, your current body fat percentage. Decide how much fat you want to lose and how much muscle you want to build. Then choose one direction to go in first: a lean bulk, or a cut while strength training. Then execute it for long enough to be able to judge it. Months, not weeks.

It might be better to build muscle first

This is the part that surprises people most, and it's the last principle I want to leave you with.

If you're carrying very little muscle, going straight into a deficit is usually the worst available option. You'd be asking your body to give something up at the exact moment it has the least to spare, and you'd be doing it from a metabolic position that makes every future attempt harder. It's the first step of the cycle I described in the last piece.

Building first inverts that. You add tissue that raises what you burn at rest, makes you more insulin sensitive, and — this is the part that matters most — gives you something to protect when you do eventually cut. You go into the deficit from a position of strength rather than desperation. And you'll often find that the composition change alone does more for how you look than the scale number you were chasing.

It also means accepting that the scale may go up before it goes down. For a lot of people that's the hardest part, and it's exactly why this doesn't work as a six-week plan.

I'd rather you spend one honest year going in one direction than five more years going in both at once.

The people I've watched actually change their bodies are almost never the ones who were most disciplined in any given month. They're the ones who picked something defensible and stayed with it long past the point where it felt like anything was happening.

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