Most guys who get visible abs lose them within six months. Not because they stopped caring — because the approach that got them lean wasn’t built to last. A brutal cut works until it doesn’t, and the moment discipline breaks, the belly fat comes back faster than it left. Dropping to 10% body fat is achievable for most people who commit. The real skill is building a system that makes staying there the default state rather than a constant fight.
Dr. Mike Diamonds spent the better part of a decade testing this. A retired physician and professional natural bodybuilder, he’s deliberately cycled through gaining and losing belly fat five times — not by accident, but to isolate what actually drives the result. What he landed on isn’t complicated, but it runs counter to what most fat loss content tells you.
The Deficit Problem Nobody Talks About
A 1,000-calorie deficit sounds efficient. In practice, it accelerates muscle loss, tanks training performance, and makes hunger unmanageable within three or four weeks. When people abandon an aggressive cut early, they’ve typically lost more lean tissue relative to fat than they intended — and the rebound period adds body fat back faster than muscle can return.
The math changes when you anchor the deficit to your actual Total Daily Energy Expenditure and hold a moderate reduction — 300 to 500 calories below maintenance. Progress is slower on the scale, but adherence is dramatically higher, and the body composition at the end reflects it. A cut you finish is worth far more than an extreme one you abandon in week four.
Why Zone 2 Outperforms HIIT for Belly Fat
People want to associate fat loss with intensity — the harder the effort, the more it must be working. The physiology doesn’t support this framing. Zone 2 cardio, where you’re working hard enough to raise your heart rate substantially but can still hold a conversation, is the zone where fat oxidation is highest relative to total energy use.
Two to three sessions per week, thirty to forty minutes each, creates meaningful caloric expenditure without triggering the hunger response that high-intensity work reliably generates. HIIT has a place — one session weekly to maintain cardiovascular adaptation — but making it the primary tool is why so many people find that adding cardio doesn’t move their weight. The appetite effect neutralizes most of the caloric benefit.
The Number Most People Ignore
Daily step count is one of the bluntest instruments in fat loss and also one of the most reliable. Eight to ten thousand steps per day builds a consistent non-exercise activity output (NEAT — non-exercise activity thermogenesis) that accumulates significantly across a week. What gets missed in most training plans is that structured gym sessions only account for a fraction of daily calorie output. The gap is filled — or not — by how much you move the rest of the time.
Four gym sessions per week combined with twelve hours of sitting doesn’t produce the caloric math most people assume. Tracking steps and setting a daily baseline makes visible the variable that training programs don’t cover. Someone who hits 10,000 steps on their rest days is doing more total fat-burning work than someone who trains hard and then moves very little otherwise.
Don’t Drop the Weights When You Start Cutting
The instinct during a fat loss phase is to shift toward higher reps, lighter loads, and circuit-style training that feels more aligned with the goal. This is the wrong direction. The training stimulus that built the muscle is the same stimulus required to preserve it in a deficit. Progressive resistance, compound lifts, and sufficient volume per muscle group signal the body to hold onto lean mass rather than cannibalize it.
Cutting calories without maintaining training intensity produces the “skinny fat” outcome — lower on the scale but softer than expected, with little of the muscular definition that made getting lean worthwhile. Heavy training during a cut is what separates a physique recomposition from just losing weight.
Keeping It After You’ve Got It
The maintenance phase is where most people skip the debrief. After a cut, transitioning back to maintenance calories has to happen gradually — reverse dieting — or the body responds with rapid fat regain as it replenishes glycogen stores and adjusts to the higher intake. The same system that drove the cut, applied in reverse over four to six weeks, is what keeps the results stable.
What this looks like in practice: slow calorie additions (50 to 100 per week), continued step targets, maintained training frequency, and body weight check-ins every week or two. The maintenance phase isn’t a reward period — it’s where the long-term outcome is either locked in or lost.
The video below is Dr. Mike Diamonds walking through the full system in his own words — the exact approach he used to eliminate belly fat and maintain visible abs for over a year. He covers each of these variables in practical, first-person detail, and the pacing makes it easy to take notes. If the reasoning above clicked, the video is worth thirty minutes.
None of this is magic. It’s a moderate deficit, the right kind of cardio, consistent movement throughout the day, and training that preserves what you’ve built. Put those four things together and stay patient — the belly fat goes, and this time it doesn’t come back.
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