Dairy: cut for the wrong reasons, kept for the wrong week

Dairy is the food group fighters remove most often and justify least well.

Two claims come up every time. They are not equally true, they are constantly confused with each other, and both have been examined properly.

The mucus claim

The belief that milk produces mucus and therefore affects breathing is very old and very widely held. Surveys in Australia found close to 30 percent of the population believed it.

In one survey of parents at a paediatric respiratory clinic, 58 percent were convinced of it.

It has been tested about as directly as a belief can be.

Sixty volunteers were deliberately infected with a common cold virus. Over 10 days their milk and dairy intake was recorded, and their nasal secretions were physically collected and weighed.

Intake ranged from none to 11 glasses of milk a day.

There was no association between milk intake and the weight of nasal secretions, nor with symptoms of congestion in the upper or lower airway.

A second study makes the same point from another direction. When people were given a soy-based drink with similar texture to milk, they reported the same sensation. Whatever produces the feeling is about the physical properties of a thick liquid coating the throat, and it is not specific to dairy at all.

The sensation is real. The conclusion drawn from it is not.

The lactose claim

This one is real, common, and worth taking seriously. It is also diagnosed badly.

Lactose intolerance means the enzyme that breaks down milk sugar is in short supply. The result is bloating, gas and abdominal discomfort.

Nothing respiratory, nothing about mucus, nothing that has any bearing on breathing in the twelfth round.

Prevalence varies enormously between populations, which is why a coach from one country and a fighter from another can hold completely different views and both be describing their own experience accurately.

This is the part that matters.

So roughly half the people who have removed dairy on the basis of how they feel do not have the condition they think they have.

And a third possibility that complicates both

Some of the people who react to milk are not reacting to lactose.

In a double-blind placebo-controlled challenge among patients with self-reported milk intolerance who had tested negative for lactose malabsorption, 86 percent had symptoms when given whole cow's milk. Nine percent reacted to the placebo.

So something in milk was genuinely producing symptoms, and it was not the sugar.

That changes the practical answer. Somebody who is lactose intolerant can usually manage hard cheeses, live yoghurt and whey isolate, all of which are much lower in lactose.

Somebody reacting to something else in milk may not get the same benefit from that switch.

Which is another argument for testing rather than reasoning about it.

How to actually settle it

Not by guessing. Not by removing everything for a month and deciding you feel better, because a month of paying attention to your diet makes almost everybody feel better regardless of what they removed.

The proper method takes a couple of weeks and answers the question permanently. It is set out in gluten, lactose and the fighter who cut a food group for no reason, and it is a better trade than a decade of avoiding a food group on suspicion.

What it gives you if you keep it

Protein of high quality, and calcium in a form that is easy to eat in useful amounts.

Calcium matters more here than in most sports. Combat athletes who cut weight repeatedly, and female athletes especially, sit in the group where bone health is a live question rather than a distant one.

Dairy is the easiest way to cover it, though other foods can do the job.

The week where cutting it is right

The reasoning in the final days is the same as everywhere else on this site: volume, residue, and how well it sits. Not that dairy is harmful.

Even people who tolerate it perfectly find that a large volume of milk in fight week is one variable too many, and a bloated gut on the morning of a weigh-in is a bad place to discover your personal limits.

That removal is temporary and specific. It ends at the scale, and it is not evidence that you should have cut dairy all along.

Which dairy, in numbers

Dairy is a category rather than a food, and the differences inside it are larger than the difference between dairy and not.

Cottage cheese and Greek yoghurt are the two that earn their place in a deficit, and both are also low enough in lactose that many people who cannot manage milk handle them without difficulty.

Hard cheese is the one that catches people. The protein is excellent and the calorie density is high enough that it functions more like a fat than a protein in a weekly total. Fifty grams of cheddar is around 200 calories, which is not what most people expect from a snack they think of as protein.

The sugar question

Flavoured yoghurt is frequently closer to a dessert than to the food on the row above.

A single pot can carry 15 to 20 grams of added sugar, which is not a health emergency and does change what you thought you were eating.

The protein figures quoted for Greek yoghurt apply to the plain version.

The practical version is plain yoghurt with fruit added yourself, which costs nothing, tastes similar, and gives you a food you can actually account for.

Casein, and the one use that is specific to it

Dairy protein is roughly 80 percent casein and 20 percent whey, and the two behave differently.

Whey is absorbed quickly. Casein forms a gel in the stomach and releases amino acids slowly over several hours, which is why cottage cheese and milk before bed have a following.

The evidence for that practice is reasonable rather than dramatic. A slow-release protein overnight makes sense mechanistically, and the practical effect on a fighter who is already hitting his daily total across four or five feeds is small.

Where it is genuinely useful is the opposite situation: somebody whose last meal is early because of training or work, facing 10 or 11 hours without food.

There the slow release is doing something the schedule otherwise prevents.

Plant alternatives, briefly

Somebody removing dairy for a real reason usually replaces it with an alternative milk, and those are not equivalent to each other.

Soy is the only common one with protein content close to dairy, at around 3 grams per 100 millilitres. Almond, oat, rice and coconut versions carry very little protein, often under 1 gram, and are essentially flavoured water with some added nutrients.

That matters because a fighter switching from milk to almond in his morning oats has quietly removed several grams of protein from his day and probably not accounted for it.

Check the calcium too. Most commercial alternatives are fortified and some are not, and if you removed dairy for the reasons in this article, calcium is the thing you were getting from it.

Fermented dairy and the gut

Live yoghurt and kefir contain bacterial cultures, and those cultures are the reason people with lactose difficulty often tolerate them better than milk: the bacteria have already broken down part of the lactose before you eat it.

Claims beyond that get made freely and hold up less well. The evidence that fermented dairy improves immune function or training outcomes in healthy athletes is thin, and anybody selling a yoghurt on that basis is ahead of the data.

What is safe to say: if you tolerate live yoghurt and not milk, that is a real and useful difference, and it means the food group does not need removing.

One practical note for the final days. Fermented products can produce gas in people who are not used to them, which is the wrong week to discover.

What the suspicion has cost you

• If you cut dairy because of mucus or breathing, that belief has been tested by weighing what came out of people's noses. It did not survive.
• If you cut it because of bloating, that is a real thing and you are still probably wrong about which food. Test it.
• If you are genuinely lactose intolerant, you do not have to remove the whole group. Hard cheese, live yoghurt and whey isolate are usually fine.
• Keep it out of the last 3 days and put it back after the scale, where it does a specific job better than water does.

And if you have avoided it for years without ever testing, understand what that has cost you: the easiest source of calcium in a sport where bone density is a real question, removed on a suspicion that is right about half the time.