White fish: the best protein-to-calorie ratio you can buy

Every protein a fighter eats costs him something from his energy budget. Chicken breast costs 165 calories per 100 grams. Beef costs more. Eggs cost more per gram of protein than either.

White fish costs less than all of them, and by a wide margin.

The number that matters

Raw cod contains around 82 calories per 100 grams and roughly 18 grams of protein, rising to around 23 grams once cooked.

Around 87 percent of those calories come from protein. One of the best protein-to-calorie ratios available in any whole food, and the entire case for white fish in a camp.

Per gram of protein the two are similar. In absolute terms they are not. To take 30 grams of protein from cod you eat more food and spend fewer calories doing it, which in a sustained deficit is the difference between a plan you can hold and one you cannot.

The trade is volume. You will be eating a larger portion for the same protein, which is either an advantage or an inconvenience depending on whether the problem that week is hunger or appetite.

How much, in grams

Take the middle line and compare it properly. To reach the same 32 grams of protein from chicken breast you would eat around 105 grams and spend about 170 calories.

Almost identical energy, and the fish portion is half again as large on the plate.

In a week where hunger is the problem, that extra bulk is the point. In a week where appetite has gone and you are struggling to finish anything, it works against you, and chicken is the easier choice.

White fish loses roughly a fifth of its weight in cooking, less than poultry does because there is less fat to render out. Around 125 grams raw lands near 100 grams cooked.

Why it is the best protein of the final days

Three things stack in its favour, and no other protein has all three.

• No fibre, so no residue. Shared with eggs and poultry.
• Very little fat, usually under 3 percent by weight. White fish stores its fat in the liver rather than the flesh, which is why the fillet is so lean and why cod liver oil exists as a separate product. Fat slows gastric emptying, and in the final days that is the variable you are managing.
• Very little connective tissue. White fish flakes apart because the muscle structure is short and loosely bound, which is precisely why it needs less work to break down than beef of the same weight.

Put those together and white fish is arguably the single best protein for the last 3 days before a weigh-in.

It delivers protein, it is almost pure protein by calorie, and it leaves faster than anything else on the list.

Which fish, and the mercury question

Mercury accumulates up the food chain, so the rule is simple: the bigger and longer-lived the fish, the more it carries.

Cod runs at roughly 0.11 parts per million, at the low end of anything measured. For a fighter eating fish several times a week for years, that distinction is worth learning once and then applying without thinking about it again.

The micronutrients nobody mentions

White fish is not just a protein delivery system, and two things in it matter more to this population than they would to most.

Selenium. An 85 gram serving of cod provides roughly half the daily requirement. Selenium is involved in thyroid function and in antioxidant defence, and it is one of the nutrients most easily missed in a restricted diet.

Iodine. White fish is among the better dietary sources, and iodine is directly involved in thyroid hormone production.

A fighter running a long deficit is already asking questions of thyroid function without adding a dietary shortfall to it.

Neither is a reason to eat fish by itself. Both are reasons that a rotation including fish covers gaps that chicken alone does not.

What it does not give you

Omega-3.

Cod contains around 184 milligrams of EPA and DHA per 100 grams. Salmon carries many times that, frequently over 1,000.

If your reason for eating fish is the omega-3, white fish is not the fish.

This matters for anybody who read the material on nutrition and head impacts and concluded that fish is the answer. It is, but the fish in question is oily: salmon, mackerel, sardines, herring. White fish and oily fish are two different foods doing two different jobs, and a camp including both is better covered than one including either.

The drying problem, which is worse than chicken

Chicken breast dries out when overcooked. White fish does the same thing faster, because there is even less fat to buffer the process, and the window between properly cooked and ruined is measured in a minute or two.

Which produces the same failure described on the chicken page, for the same reason. A dry fillet gets butter, oil or a cream sauce added to make it edible, and a fighter who chose the leanest protein available has just added back more fat than a chicken thigh would have contained.

The methods that work are the wet ones: steaming, poaching, baking in foil with lemon and herbs, or cooking in a tomato-based sauce.

All keep moisture in without adding fat, and all are more forgiving of timing than a pan.

A note on species

They are close nutritionally and not interchangeable in the kitchen.

Thick fillets are more forgiving than thin ones, and forgiveness matters when you are cooking tired at nine at night.

Fresh, frozen and the practical version

Frozen white fish is not a compromise. Most of it is frozen at sea within hours of being caught, which frequently makes it fresher than the fillet on a counter that has been in transit for 2 days.

For a fighter, frozen is often the more practical choice: it keeps for months, portions are consistent, and it thaws quickly because the fillets are thin. Thaw in the refrigerator rather than anywhere faster.

White fish is also one of the few proteins that cooks acceptably from frozen if you have not planned ahead, provided it reaches temperature.

A genuine advantage on a day when you have not planned ahead.

The fight week version

If white fish is the best protein for the last 3 days, that needs to be concrete rather than abstract.

Steamed or baked white fish with white rice, seasoned with lemon and salt and nothing else, is close to the ideal fight-week meal. Protein that arrives and disappears, a carbohydrate with almost no residue, and enough sodium to be useful rather than a problem.

It is dull. That is not an accident and it is not a flaw. The final days are not the week for interesting food, and a fighter who understands that in advance handles them better than one who discovers it on Wednesday.

Three points for that week. Portion it larger than you would in camp, because the calorie cost is low and protein matters more than usual as total intake falls. Keep the preparation identical each time, because fight week is the wrong moment for a new sauce or an unfamiliar restaurant.

And prepare it yourself if you possibly can.

Breaded, battered and the version that is not fish

A battered fillet is a different food. The coating adds carbohydrate, the frying adds a substantial amount of fat, and the finished product bears no useful relationship to the ratio described at the top of this page.

Frozen breaded fillets and fish fingers sit in between: less fat than deep-fried, more than plain, usually with the sodium that goes with processed food.

None of it is forbidden. It is not the food this article is about, and counting it as the same thing is how a plan drifts without anybody noticing.

In an away camp

Fish is riskier than chicken to order in an unfamiliar place, for one reason: freshness is harder to judge and the consequences of getting it wrong are the same.

Grilled or steamed white fish, plain, is a reasonable order somewhere you trust. Raw fish in fight week is a risk with no upside, whatever the local standards, because food poisoning in that window costs the fight and there is no recovering from it in time.

If the kitchen is unfamiliar and the week is critical, chicken is the safer default. That is not a nutritional judgment.

The protein for the last 3 days

• Use it when calories are tight and hunger is the problem. Protein for almost nothing, and the larger portion helps.
• Use it in the final 3 days ahead of every other protein. Nothing else combines that little fat with that little residue.
• Cod, haddock, pollock, hake, sole. Not shark, swordfish or king mackerel, ever, for reasons that have nothing to do with the fight.
• Sixty-three degrees, cooked wet, and slightly under rather than over.
• Do not expect omega-3 from it. Different fish, different job.
• Frozen is usually the more practical option. Nothing is lost by choosing it.