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This is Nimesh. At 35, he had the most belly fat ever in his life — enough for it to bulge through his shirts. But less than a year later, his belly fat is now lower than 98% of men. And it’s because almost nobody approaches how to lose belly fat in 3 layers, where each layer needs a slightly different strategy. Most people get stuck in Layer 1 in their how to reduce belly fat journey, which is exactly where Nimesh started, at 29.5% body fat on Day 1.
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LAYER 1:
For Nimesh, his belly fat clocked in at 34.4% — higher than anywhere else. Nimesh felt like he’s genetically cursed, and the uncomfortable truth is… he wasn’t wrong. Almost every guy I’ve run through a Day 1 DXA scan shows the same pattern: the belly carries more fat than anywhere else.
To see how consistent this is (and whether it holds true for women), my team analyzed 8 years of DXA scans from nearly 18,000 men and women. What we found explains why how to reduce belly fat feels so frustrating: at higher body fat levels, fat drops faster from easier areas (arms/legs/hips)… while the belly lags behind. Then once you get lean enough, belly fat starts to come off faster.
For women, it’s a bit different — they usually store less fat in the belly and more in hips/legs/arms. My friend Nicole started at 33%, and her belly fat was almost identical to her overall body fat — meaning she often sees belly changes sooner than a guy at the same starting point.
Layer 1 is that soft outer belly fat that hides any ab definition. It’s usually “gone” around ~20% body fat for men and ~28% for women. The good news? This layer takes the least effort to burn off.
For Nimesh, it came down to 4 habits:
3 workouts/week (so weight loss comes from fat — and maybe even muscle gain)
Simple diet rules: protein at every meal, mostly home-cooked, built around core foods
8,000 steps/day
Track morning weight aiming for a loss of ~1 lb/week
But even though Layer 1 is easiest physically in the how to lose belly fat journey, it’s the hardest mentally — because you can be losing fat and still feel like your belly hasn’t changed. By Day 30, Nimesh was down 7 lbs and doubting everything. But measurements showed he was already down 3cm on his waist — exactly what the DXA data predicts.
By Day 90, after losing 12 lbs of fat, Layer 1 was burned off and his upper abs finally showed.
LAYER 2:
This is where most people give up when figuring out how to reduce belly fat. Layer 1 feels like nothing’s changing… but Layer 2 is where fat loss actually slows or stalls — because your body starts fighting back.
After a big drop in weight, your calorie burn drops (less body mass + subtle energy conservation). You move less without noticing. The strategies that worked in Layer 1 stop working.
So for Nimesh, we bumped steps from 8,000 to 10,000/day (a simple “insurance policy”), increased strength training volume (from a 3-day split to a 4-day split), and introduced calorie targets — because getting through Layer 2 usually means making sure your deficit is real.
We landed at ~2000–2200 calories/day, built around a structured meal plan (plus low-calorie snacks and room for one daily treat so compliance stays high).
This phase is also tricky because not everyone’s metabolism responds the same. Some people keep losing steadily. Others adapt hard and slow down — which is why tracking and adjusting matters.
By the end of Layer 2, belly definition really starts showing — but most people still have softness in the lower belly and love handles.
LAYER 3:
This is the stubborn belly fat layer — and less than 1% of people ever push through it.
Here’s the twist: visually, this layer progresses the fastest (because there’s less fat covering your abs). But every pound feels like a battle. Stubborn fat areas tend to have more alpha-2 receptors (brakes) vs beta receptors (gas), which makes lower abs/love handles/hips harder to lean out.
At this stage of your how to lose belly fat journey, hunger ramps up, energy drops, and stress hormones rise — which can also make you hold water. So you can wake up feeling like your belly looks worse overnight even when you’re doing everything right.
For Nimesh, we used 2 strategies:
Make every calorie count (small swaps, fewer liquid calories, more satiety foods)
Diet breaks — bring calories up for 5–14 days (often improving sleep, stress, hunger, and water retention)
After 5 days, his abs looked sharper again and he was ready to push forward.
From start to finish, Nimesh’s journey took 275 days (including a 5-week trip where he focused on maintenance). Final results: total body fat dropped from 29.5% to 16.7%. Belly fat dropped from 34.4% to 13%. And he gained almost 7 lbs of lean mass.
0:00 – Belly Fat Science
3:20 – Layer 1
6:58 – Layer 2
12:31 – Layer 3
18:40 – Final Result
source

Happy 2026 everyone!! Hope you enjoyed this one!!
Three important things:
1. To help kickstart your New Year, our Built With Science+ app is currently 20% off until January 11th. If you want your training and nutrition taken care for you in one simpel to follow app, so all you have to do is follow the plan like Nimesh did, then now is the perfect time to join. You get a 2 week free trial to see if it's the right fit for you – so there's no risk. HIGHLY recommend at least trying it out, and you can do so here: https://bws.plus/7a
2. If you want a free download of the meal plan I designed for Nimesh, you can get that here: https://builtwithscience.com/fat-loss-meal-plan-2026
3. You might have been surprised with Nimesh's final body fat % result being higher than what it looks like. While DEXA's are reliable there is still a margin of error, plus it factors in TOTAL body fat %. We actually noticed that Nimesh's most stubborn areas were in his legs/hips. So even as he got really lean, those areas stayed high in body fat %, skewing his overall body fat % upwards. Yet when we looked at his belly it dropped down to 13% (which visually looks pretty spot on to what it actually was). Just wanted to clarify that since I'm expecting quite a few questions coming up about that. Overall though what you visually see is the most important, as everyone holds onto certain areas of fat differently!
Hope this helps! Let's get it!!
I like that it’s not just about losing weight, but building habits you can actually stick with. Tracking progress and recovery along the way makes a big difference too.
I am barely on week 2 of my diet/exercise. Walking 4 miles a day in week 1 I lost 4lbs. Probably all water weight. Second week continued walking daily, lean eating in calorie deficit for my weight and height, and started weighted exercises but I am stuck already. Unable to lose it, my weight is going up .x and I am on the third day I am crashing and extremely tired all day long. I am still pushing and continuing but it is such a struggle when I just want to sleep instead. Plus I have a headache everyday
I just realised – we're all going to die anyway. So this is completely pointless!
This was exactly what I needed to hear! 🔥 No quick fixes, just practical advice that actually makes sense. Definitely saving this and staying consistent until summer! 💪
Absolutely terrific content 👊
Jeremy is on steroids. All content is complete horseshit
How does anyone walk 10,000 steps? It takes me all day to walk that. Secrets?
This wanted lose breakdown is practical because it keeps the focus on consistency, not quick fixes.
this kind of planner fits that same lane for people trying to stay consistent by helping turns the idea into a practical next step.
I would love it if you had a women like me mom of 2 both kids c section and under 5ft
Hi Jeremy, If you are up for challenge. I would love to workout with you on my fitness journey being a vegetarian. Let me know.
Can you make this video with an Indian guy? That guy is me, I want a transformation like this, but I don't have any money." 🇮🇳
after having lost 15 kgs being look like at nimesh's start point is so bad…i am so sad now…
How nice it must be to be able to lose fat while eating so many calories. I've been on BWS over a year, and it only gives me 1200 daily calories. Pretty hard to sustain, pretty miserable, and hard to eat a variety of healthy foods without going over. Feeling pretty discouraged tbh.
Its called WIMIN!
4:22 Namesh is that Laurelhurst (Seattle)??
what about just doing keto (zero carb) (and moderate exercise)
Hi there,
Is this even sustainable ?
I think that if he had introduced an intermittent fasting into his routine (16/8 for example) he would have reached the same results, faster, and it would be more of a way of life for the long term instead of just a goal to reach, take some photos and then go back to fat mode…
Have a good evening
He has better abs then me with 13% of body fat 😀
This was so good! I'm a woman and really enjoyed the female part could you do a woman? As a profile? Or with the woman that you had in the series but you focused on Nimesh? I have shared 40 LB and I have recently purchased the weight option with Tracy Anderson and she's the only workout that I want to do I also run sprint hike with my husky dog so that movement has really helped I'm 50 next year but want to be more compact and seem to have a lot of belly fat I do drink wine though! But I live with a teen and I'm a single mum! But I'm really keen what I really loved about this was the science and just not the rushing and just this longevity this understanding that it could take a long time if you don't want to rush it anyone sustained results and I love the science of it as well… I would love to know more about the female approach to that final layer I will have a look at your channel of course in case you have covered with but if not would be great to know more my visceral fat is for sometimes three but my subcutaneous fat is about 28% I'm getting stronger all the time but now I'm hitting 50 the collagen is getting loose so I just want to be more compact… I probably don't eat enough I'm trying to get more protein shakes and I only have one meal a day I just don't have the appetite and I'm an endomorph so I do put on way easier if I put up the carbs I've taken many many years to address conscious eating so I don't want to wear back into over reading and I don't eat meat but I will eat fish so I found protein shakes for the better way to get fruit and they're not too much fruit just blueberries and vegetables and protein in but that's just recent addition I started out on smoothies but that was about 15 years ago I have celery juice to start the day I'm vibrant and have lots of energy but I just want to be less wobbly but not lose my feminine look just want to have a really lean stomach I think being an end of it if you can get the composition write as one of the most feminine figures and I don't want to celebrate that! I'm 5 foot six and even though I'm much smaller I'm 130 5LB in a bikini I sit down I still have gut rolls that I don't want!! X
Just goes to show you– Abs are built in the kitchen, not the gym. Way to go Nimesh!