Oats: still the cheapest decent breakfast before training

Most questions about oats come down to two things: how much protein is actually in there, and whether a bowl of porridge in the morning quietly makes you fat. Both answers are duller than people expect.

Oats are cheap, they sit in a cupboard for months, they need no cooking if you cannot be bothered, and they turn into a 30 g protein meal the moment you add the right thing. That is roughly the entire job description of a pre-training breakfast.

What a portion actually gives you

The numbers below are rounded averages for dry oats. They shift with the type of flake (jumbo, quick, instant) and with how you cook them, since oats soak up two to three times their own weight in liquid.

Per 100 g of dry oats, roughly:

• about 380 kcal
• about 12 g protein
• about 10 g fibre, of which around 4 g is beta-glucan
• about 60 g carbohydrate
• about 7 g fat

Nobody eats 100 g. Most people measure out 50 to 80 g. At 60 g that is roughly 230 kcal, 8 g protein and 6 g fibre, before whatever milk, yoghurt or fruit you put on top.

Eight grams of protein is less than two eggs. So the honest description is this: oats are not a protein food, they are a carrier. The protein comes from what you serve with them.

Fibre is where oats earn their place. Beta-glucan is a soluble fibre that slows stomach emptying and keeps you full longer than white bread of the same calorie value. For lowering LDL cholesterol the evidence is strongest at intakes around 3 g of beta-glucan a day, which is roughly 75 to 80 g of dry oats. The effect is modest rather than dramatic, and it does not replace medication.

Fitting them into the day

If you train in the afternoon or evening, oats are simply one ordinary meal. There is nothing to time around a session that is nine hours away.

If you train in the morning, the rule of thumb is a full portion two to three hours beforehand. Fibre and fat slow digestion, and 70 g of oats with peanut butter half an hour before heavy squats tends to sit like a brick.

With an hour or less, drop to 30 to 40 g of quick flakes, keep the protein, and skip the nuts. That is the same logic behind the fast options in our piece on a five-minute breakfast with 30 g of protein.

After training oats work well as a cheap, easy source of carbohydrate. If your appetite is flat straight after a session, a liquid version goes down more easily, much like protein coffee does.

Who they suit, and who they do not

They suit you if you want cheap fullness, if your fibre intake is low, if you need breakfast prepared the night before, or if you are losing weight and need a meal that lasts.

They suit you less if you are trying to gain weight with a small appetite, because a bowl of oats fills you up long before it delivers useful calories. Liquid calories are more practical there.

They also suit you less if a large fibre load before a morning session leaves you bloated. Halving the portion and taking the rest of the calories afterwards usually solves it.

Anyone with coeliac disease needs oats labelled gluten free. Oats contain no gluten themselves, but they are routinely mixed with wheat during milling and packing.

Three combinations that hit the protein target

Numbers are rounded and depend on the products you use.

1. Oats and skyr: 60 g oats, 200 g skyr, a banana and a tablespoon of peanut butter. Around 33 g protein and about 520 kcal. The differences between the dairy options are broken down in our piece on skyr, quark and cottage cheese.
2. Overnight oats: 50 g oats, 250 ml milk and a scoop of whey, left in the fridge. Around 34 g protein and about 420 kcal, with no cooking at all.
3. Savoury oats: 40 g oats cooked in water, two eggs and 30 g cheese. Around 25 g protein and about 500 kcal, useful if sweet food in the morning puts you off.

Common misconceptions

Oats burn fat. They do not. They help only in the sense that they keep you full, which makes a calorie deficit easier to hold.

Instant oats are worthless. Calories and protein are practically identical to jumbo flakes. Finer flakes digest faster and raise blood sugar more sharply, but once yoghurt or eggs are on the plate that gap is small for a healthy person. The thing worth avoiding is flavoured sachets with added sugar and a tiny portion size.

Oats have plenty of protein. Decent for a cereal, yes, but the amino acid profile is weaker than milk or eggs. The same question comes up with pulses, which we cover in the article on how much protein chickpeas, beans and lentils really deliver.

Oats bloat everyone. Bloating usually comes from a sudden jump in fibre. If you were eating 12 g of fibre a day until yesterday, start with 40 g of oats and build up over a fortnight.

When to see a doctor

See a doctor about persistent stomach pain, diarrhoea or unexplained weight loss, since none of that is a breakfast problem. The same applies if you take cholesterol medication or have diabetes and plan a serious change to how you eat.

The short version

A hundred grams of dry oats gives roughly 380 kcal, 12 g protein and 10 g fibre, and a realistic 60 g portion gives about 230 kcal and 8 g protein. On their own they are not a protein meal, but with 200 g of skyr or a scoop of whey they clear 30 g easily. Eat the full portion two to three hours before training and a smaller one an hour before. Cheap, filling, and that is the whole story.