Fibremaxxing: How Much Fibre Do You Actually Need?
The honest guide to the fibremaxxing trend: how much fibre you really need per day, why it matters if you train, the highest-fibre foods to hit ~30 g, and how to ramp up without wrecking your gut.
Protein got its moment. Now the internet has found its next macro obsession: fibremaxxing — deliberately loading your day with as much fibre as you can from beans, oats, seeds, fruit and vegetables. Like most trends it's half right: fibre is genuinely one of the most underrated things on your plate, and most people eat far too little of it. But "maxxing" it overnight is also the fastest way to spend an afternoon regretting your smoothie.
This is the honest version: what fibremaxxing actually is, how much fibre you really need, why it matters if you train, where to get it, and how to ramp up without wrecking your gut.
The short version: Aim for roughly 30 g of fibre a day from real food — a mix of soluble and insoluble. Most people get half that. Fibre keeps you full (a huge help in a diet), feeds your gut, and steadies blood sugar. Increase it gradually and drink more water, or "maxxing" backfires.
What is fibremaxxing?
Fibre is the part of plant foods your body can't digest. Instead of being absorbed for energy, it passes through — and does its best work on the way. "Fibremaxxing" is just the social-media name for prioritising it: building meals around high-fibre foods the way the last few years taught everyone to build meals around protein.
There are two kinds, and you want both:
- Soluble fibre dissolves into a gel — it slows digestion, blunts blood-sugar spikes and helps lower cholesterol. Think oats, beans, lentils, apples, chia and psyllium.
- Insoluble fibre adds bulk and keeps things moving — the "roughage" in wholegrains, vegetable skins, nuts and seeds.
Most whole plant foods give you a mix, so you don't need to count the two separately. Eat a variety and both boxes get ticked.
How much fibre do you actually need?
The target most guidelines land on is about 30 g a day for adults. The German-speaking (DACH / DGE) recommendation is at least 30 g a day; the EU food-safety authority (EFSA) puts 25 g a day as enough for normal bowel function; and the US figure works out at 14 g per 1000 kcal (~25 g for many women, ~38 g for larger or very active men). Call ~30 g a solid practical target. The real problem is the gap: typical intake in Switzerland and across Europe sits nearer 15–20 g, so most people aren't overdoing fibre — they're running at half.
| Your situation | Sensible daily fibre |
|---|---|
| Current average adult | ~15–20 g (too low) |
| General health target | ~30 g |
| Larger / very active, eating more food | 35–40 g |
| "Fibremaxxing" territory | 40–50 g is already a lot — only worth it if you tolerate it well |
More is not endlessly better. There's no simple, universal upper limit — but for most people 40–50 g is already plenty: the extra benefit flattens and the downsides (bloating and gas) get more likely. On a very high-fibre, phytate-rich diet the absorption of individual minerals like iron or zinc can dip a little too — mostly when the overall diet is unbalanced to begin with. The win is getting to ~30 g consistently, not racing past it.
Why fibre matters if you train
Fibre isn't just a digestion thing — it quietly supports almost everything else you're training for:
- It keeps you full in a diet. High-fibre foods are bulky and slow to eat, so they blunt hunger on fewer calories. If you're cutting, fibre is one of the best tools you have to make a deficit livable — right alongside protein.
- It steadies everyday energy. Soluble fibre slows how fast carbs hit your blood, which flattens the spike-and-crash across the day. The exception is right before an intense session — there, easy-to-digest carbs are usually the better call (more on timing below).
- It feeds your gut. Your gut bacteria ferment fibre into short-chain fatty acids linked to better gut and metabolic health. A well-fed microbiome is increasingly tied to recovery, immunity and mood.
- It's heart and health insurance. High-fibre diets are among the most consistently protective eating patterns in the research — lower cholesterol, better blood-sugar control, lower risk of heart disease and bowel cancer.
None of this is exciting on a single day. It compounds — which is exactly why the athletes who feel best six months in are usually the ones quietly eating their vegetables.
Fibre and training: get the timing right
Fibre is a friend on most of the day — but it's the one meal right before a hard session where "maxxing" works against you. This is the part the trend never mentions, and it's the part that matters most if you train or race.
- Keep the pre-workout meal low in fibre. A big bean bowl an hour before intervals, a long run or a Hyrox session is a recipe for cramps, gas and a mid-session dash to the toilet. In the 1–3 hours before hard training, lean on easy-to-digest carbs — white rice, a banana, white toast, a sports drink — and save the high-fibre plate for afterwards.
- On race day, go even lower. Endurance athletes deliberately drop fibre in the 24–48 hours before a long event to keep the gut quiet. If you've got a running race, a triathlon or a hybrid event coming up, this is standard practice — not fussiness.
- Big-appetite training days are the exception to "more is better." If you're doing high-volume endurance work and need a lot of carbs to fuel it, very high fibre can get too filling to eat enough. Runners and cyclists chasing big calorie and carb numbers sometimes have to ease off fibre so the fuel actually fits.
- Load your fibre in the meals away from training. Breakfast on a rest morning, lunch, or your evening meal after you've trained — that's where 30 g lands comfortably without touching performance.
So the athlete's version of fibremaxxing isn't "as much as possible, always." It's "plenty across the day, and almost none in the meal right before you go hard."
Where to get it: high-fibre foods
You don't need supplements to hit 30 g. Real food does it easily, and you can find all of this at any Migros or Coop. Here's roughly what a normal portion delivers:
| Food | Portion | Fibre |
|---|---|---|
| Cooked lentils | 100 g | ~8 g |
| Cooked beans (kidney, black, white) | 100 g | ~7 g |
| Chickpeas | 100 g | ~7 g |
| Chia seeds | 15 g (1 tbsp) | ~5 g |
| Rolled oats | 50 g dry | ~5 g |
| Raspberries / blackberries | 100 g | ~6 g |
| Pear (with skin) | 1 medium | ~5 g |
| Avocado | ½ | ~5 g |
| Ground flaxseed | 15 g | ~4 g |
| Wholegrain pasta | 100 g cooked | ~4 g |
| Apple (with skin) | 1 medium | ~4 g |
| Almonds | 30 g | ~3.5 g |
| Wholegrain bread | 1 slice (~45 g) | ~3 g |
| Broccoli / carrots | 100 g | ~3 g |
Notice the pattern: legumes are the powerhouse. A single portion of lentils or beans does more for your fibre total than almost anything else — and it brings protein along for the ride. Build a couple of meals a week around them and 30 g stops being a stretch.
How to actually hit 30 g
You don't have to overhaul anything. Three or four small swaps usually get you there:
- Fix breakfast first. Oats, or wholegrain bread over white, or berries and chia in yoghurt — breakfast is the easiest 8–10 g of the day.
- Add a legume, don't replace the meat. Stir lentils or beans into a bolognese, curry or salad. You keep the protein and gain 7–8 g of fibre.
- Eat the skins. Leave the peel on apples, pears and potatoes — a lot of the fibre lives right there.
- Default to wholegrain. Wholegrain bread, pasta and rice quietly add a few grams per meal with zero effort.
- Keep fruit and veg visible. A piece of fruit as a snack and a fist of vegetables at two meals covers a surprising amount of the target.
The catch: don't actually "max" it overnight
This is where the trend gets people. Fibre is fermented by your gut bacteria, and they need time to adapt. Go from 15 g to 45 g in a single day and you'll get the classic result: bloating, gas and cramps. That's not fibre being bad — it's fibre being rushed.
Do it right instead:
- Ramp up over 2–3 weeks, adding ~5 g at a time and letting your gut catch up.
- Drink more water. Fibre — especially soluble — pulls in water to do its job. Too much fibre with too little fluid does the opposite of what you want and can leave you constipated.
- Spread it across the day rather than one giant bean-and-oat bomb.
- Whole food beats a scoop. A fibre supplement (psyllium, inulin) can help close a genuine gap, but it doesn't carry the vitamins, minerals and satiety that come with real high-fibre food. Use it as a top-up, not the plan.
If you have a gut condition like IBS, some high-fibre foods (certain beans, onions, wheat) can trigger symptoms — ramp slower, notice your own triggers, and talk to your doctor or a dietitian.
Fibre vs protein: you don't have to choose
The good news for anyone who spent the last year chasing protein: the best fibre foods are often also good protein foods. Lentils, beans, chickpeas, edamame and oats all pull double duty. A bowl built on legumes and wholegrains hits both targets at once — which is why "should I prioritise protein or fibre?" is mostly a false choice. Anchor meals on protein, make the carbs and sides high-fibre, and both numbers take care of themselves.
The simple rule
If you remember nothing else:
- Aim for ~30 g of fibre a day — most people are at half.
- Legumes first — lentils and beans are the fastest way to move the number.
- Wholegrain over refined, skins on, fruit and veg visible.
- Ramp up slowly and drink more water — the whole point of "maxxing" is undone if you rush it.
- Real food over a scoop.
The bottom line
Fibremaxxing is a good trend wearing a silly name. Fibre really is one of the highest-leverage, most-neglected things on your plate — better fullness in a diet, steadier energy, a healthier gut, and long-term protection that shows up for years. The move isn't to slam 50 g tomorrow; it's to climb calmly to ~30 g of real, varied, high-fibre food and stay there.
The catch is that fibre doesn't live alone — it sits inside a bigger picture of calories, protein and how you train. That's what GetMyCoach ties together: a plan that sets your calorie and protein targets from your goal and bodyweight, with food guidance that helps you build meals that are genuinely filling — fibre included — instead of guessing.
Get my nutrition & training plan →
Frequently asked questions
What is fibremaxxing? Fibremaxxing is the social-media name for deliberately prioritising fibre — building your meals around high-fibre foods like beans, lentils, oats, seeds, fruit and vegetables. It's a useful idea because most people eat far too little fibre, but "maxxing" it overnight causes bloating; the goal is a steady ~30 g a day, not a race.
How much fibre do I need per day? About 30 g a day for most adults — the Swiss/DACH recommendation, and close to the US target of 14 g per 1000 kcal. Typical intake is only 15–20 g, so most people are running at roughly half.
Can you eat too much fibre? Yes. Increasing your intake too fast, or pushing well past what you comfortably tolerate, causes bloating, gas and cramps. On a very high-fibre, phytate-rich diet the absorption of minerals like iron or zinc can also dip a little — mostly when the overall diet is unbalanced. Ramp up gradually and drink more water.
Does fibre help with weight loss? Indirectly, and a lot. High-fibre foods are filling and slow to eat, so they make a calorie deficit easier to stick to. Fibre itself doesn't burn fat — the deficit does — but it's one of the best tools for staying full while you diet.
What foods are highest in fibre? Legumes lead: cooked lentils and beans give ~7–8 g per 100 g. Then chia and flaxseed, oats, berries, pears and apples with the skin, avocado, nuts, and wholegrain bread, pasta and rice.
Last updated: July 2026. This article is general educational information, not medical or nutritional-medicine advice. Fibre tolerance is individual; if you have IBS, another gut condition, or a medical reason to watch your fibre intake, talk to your doctor or a dietitian. Food fibre values are typical figures and can vary by product and preparation — check the packaging when in doubt.