Fibre, fullness and fat loss

How fibre helps

• Bulk and volume. High-fibre foods take up more space in your stomach for the same calories, which helps you feel satisfied.
• Slower digestion. Some types of fibre slow how quickly food leaves your stomach, keeping you fuller for longer and smoothing out blood sugar.
• More chewing. Whole, fibrous foods take longer to eat, giving your fullness signals time to catch up.
• Gut health. Fibre feeds the bacteria in your gut, which is linked to a range of health benefits. See gut health basics.
• Health beyond weight. Higher fibre intakes are consistently associated with lower risk of heart disease, type 2 diabetes and bowel cancer.

None of that requires special products. The best sources are ordinary, cheap foods that most UK supermarkets have plenty of.

How much you need

UK guidelines recommend 30 g of fibre a day for adults. On average, adults in the UK manage around 20 g, so most people have plenty of room to improve. Our main guide on fibre covers the different types and what they do.

UK food labels list fibre per 100 g, and a product with at least 6 g per 100 g can be described as high in fibre. Checking labels on bread, cereal and wraps is an easy way to pick the higher-fibre versions.

Rough fibre content of some common foods:

• 40 g of porridge oats: around 4 g.
• Half a tin (about 120 g drained) of kidney beans or chickpeas: around 5 to 8 g.
• A medium baked potato with the skin: around 4 to 5 g.
• Two slices of wholemeal bread: around 5 g.
• A pear or an apple with the skin: around 3 to 5 g.
• 80 g of frozen peas: around 4 g.
• A large handful (80 g) of raspberries: around 5 g.
• 80 g of broccoli: around 2 to 3 g.

A day that hits 30 g

• Breakfast: porridge made with 50 g of oats, topped with berries and a spoonful of chia or ground flaxseed (about 9 to 11 g).
• Lunch: a wholemeal wrap with chicken, salad and a couple of spoonfuls of hummus, plus an apple (about 9 to 11 g).
• Dinner: chilli with lean mince and kidney beans, served with brown rice and a side of peas (about 10 to 12 g).
• Snack: a pear or a small handful of almonds (about 3 to 5 g).

None of this is unusual food. It is ordinary meals with a few deliberate choices, and it comes to well over 30 g without a single supplement.

If that looks like a lot of change at once, start with breakfast. Switching from white toast or a sugary cereal to porridge or a high-fibre cereal with fruit can add 5 to 8 g on its own.

Volume eating: more food for fewer calories

Many high-fibre foods, especially vegetables and fruit, are also high in water and low in energy density. That means you can eat a large, satisfying portion for relatively few calories. It is a simple, effective strategy often called volume eating.

• Start meals with a salad or a bowl of vegetable soup.
• Bulk out bolognese, chilli and curry with extra onions, peppers, mushrooms, carrots, lentils or beans.
• Swap half your rice or pasta for extra vegetables.
• Choose whole fruit over juice or smoothies.
• Keep bags of frozen vegetables in the freezer so there is always an easy side.

Our guide to eating more vegetables has more ideas, including ways to get fussy eaters on board.

Increase it gradually

A sudden jump from 15 g to 35 g of fibre can cause bloating, wind and discomfort. Increase over two or three weeks, adding one higher-fibre swap every few days, and drink plenty of fluids, because fibre works best with water. Starting with smaller portions of beans and lentils also helps your gut adjust.

If you have IBS or another gut condition, some high-fibre foods may trigger symptoms. That does not mean avoiding fibre altogether, but you may need to choose your sources carefully, and your GP or a registered dietitian can help. See your GP promptly if you notice a lasting change in bowel habits, blood in your poo or unexplained weight loss.

Fibre and protein together

The most filling meals combine protein and fibre: chicken with beans and vegetables, Greek style yoghurt with berries and oats, eggs with wholemeal toast and spinach, or a lentil and vegetable curry with a side of yoghurt. Build most meals like that and hunger becomes far more manageable. The hand portion guide makes it easy without counting.

If you want help building filling meals around your training and routine, Lycan Strength offers nutrition and accountability coaching alongside its classes.