Fibermaxxing: what it is, how much fibre you need and how to get there safely

October 12, 2026

Guiso de lentejas con pan en una mesa de cocina, con luz de ventana

Fibermaxxing is the trend of deliberately increasing the fibre in your diet, mainly through real foods such as pulses, fruit, nuts and whole grains. The underlying idea makes sense: adults in Spain eat around 12.6 g of fibre a day on average, half of the 25 g the EFSA considers adequate. The key is to increase it gradually and drink more water as you go.

What fibermaxxing is and where it comes from

The name comes from TikTok and the "maxxing" family of trends, which push one aspect of health or appearance to the maximum. After several years in which protein dominated the conversation, fibre has taken over: trend reports such as the one from the Johns Hopkins Center for a Livable Future name it one of the star nutrients of 2026.

In practice, people who do fibermaxxing set a daily target (social media is full of goals of 30 g or more), count grams and fill their plates with pulses, seeds and unpeeled fruit. Part of the interest comes from its link with gut health and from the wave of "GLP-1 friendly" food, aimed at people on medicines such as Ozempic who look for filling meals with little volume.

Soluble and insoluble fibre: what each one does

"Fibre" covers several different substances. Broadly speaking:

Soluble fibre. It forms a kind of gel with water. This group includes beta-glucans from oats and barley, among the few types of fibre with health claims approved by the European Union: they contribute to the maintenance of normal blood cholesterol levels (the effect is obtained with 3 g of beta-glucans a day) and, eaten as part of a meal, they contribute to the reduction of the blood glucose rise after that meal.
Insoluble fibre. It does not dissolve and adds bulk. The EU recognises, for example, that barley grain fibre contributes to an increase in faecal bulk.

Most plant foods combine both types, so there is no need to track them separately. What does make a difference is variety: pulses, whole grains, fruit, vegetables, nuts and seeds provide different fibres.

How much fibre you need (and how much people in Spain eat)

In 2010 the European Food Safety Authority (EFSA) set an adequate intake of 25 g of fibre a day for adults, the amount it considers sufficient for normal bowel function. The EFSA itself notes that higher intakes are associated with benefits, such as a lower risk of heart disease, so 25 g works better as a floor than as a ceiling.

Reality in Spain falls well short. The ANIBES study, which analysed the diet of more than 1,600 adults aged 18 to 64, found an average intake of 12.6 g of fibre a day, half the recommended amount. The main sources were cereals (39% of fibre), vegetables (24%), fruit (17%) and pulses (9%).

In other words, most of us are short of fibre, and for almost everyone, sensible fibermaxxing simply means reaching the recommended amount.

The risks of overdoing it or increasing it too fast

The most common problem is speed. Going from 12 to 40 g overnight often brings wind, bloating and abdominal discomfort, because the gut and its microbiota need time to adapt. Fibre also needs water to do its job: increasing it without drinking more can backfire and cause constipation.

Some people should talk to their doctor or a registered dietitian first:

People with irritable bowel syndrome, inflammatory bowel disease or other digestive conditions.
People taking GLP-1 medicines, which often have digestive side effects already. Our guide on what to eat on Ozempic covers this in more detail.
People on regular medication, to check how to combine it with meals.

How to increase fibre gradually

The most sensible approach is to add a few grams each week and watch how your body responds. A rough plan:

Week 1. Swap white bread for wholemeal and add a whole piece of fruit a day, with the skin on when possible.
Week 2. Add pulses to two or three meals a week.
Week 3. Add a handful of nuts or a spoonful of seeds every day.
Week 4. Check how you feel and keep what works for you, around 25-30 g a day.

And every week, more water.

How much fibre some foods provide

Food	Typical portion	Approximate fibre
Cooked lentils	200 g (one plate)	15.8 g
Avocado	Half (100 g)	6.7 g
Pear with skin	1 medium (180 g)	5.6 g
Chia seeds	1 tablespoon (15 g)	5.2 g
Rolled oats	40 g	4.0 g
Almonds	A handful (30 g)	3.8 g
Satislent Food	1 meal (100 g)	7.7 g

With these figures, a day with oats and a pear at breakfast, a plate of lentils at lunch and a handful of almonds in the afternoon adds up to around 29 g of fibre, before counting the vegetables at dinner.

On days when you have no time to cook, a complete food meal can help too. One serving of Satislent Food provides 7.7 g of fibre, which comes from oats and Canarian gofio. It does not replace a varied diet, but it is a practical way to avoid falling short when you eat at the office. If that sounds familiar, we have ideas for a healthy lunch at work without cooking.

Frequently asked questions

How much fibre should I eat a day?

The EFSA considers 25 g a day adequate for normal bowel function in adults, and recognises benefits from higher amounts. Many practical guides talk about 25 to 30 g. Most of the Spanish population does not reach even half of that.

Is too much fibre bad for you?

What usually causes trouble is increasing it suddenly and without water: wind, bloating or constipation appear. If you increase it gradually and drink more, your body usually adapts. If you have a digestive condition, check with a professional first.

Which foods are highest in fibre?

Pulses, seeds (such as chia), nuts, oats and other whole grains, avocado, and fruit and vegetables eaten with their skin. Combining several is better than relying on just one.

Do fibre supplements work?

They can be useful in specific cases, usually on medical advice. For everyday eating it is better to get fibre from food, which provides different types of fibre along with vitamins, minerals and other compounds.