Alaskan King Crab Nutrition: What It Does for Your Body at 71

I was standing on the dock in Ketchikan, Alaska, looking at a chalkboard menu, and the number didn't compute.

One hundred dollars. Per leg.

Not per pound. Not per platter. Per leg.

I'm 71 years old and I've been buying seafood since before some of you were born, and I stood there doing the math twice because I assumed I'd misread it. I hadn't.

I bought one anyway.

Here's the thing about being on a longevity project: you spend a lot of time optimizing, tracking, and saying no to things. Somewhere in there you have to remember that a life worth extending is a life worth enjoying. I was on an Alaska cruise I’d booked as a longevity protocol, standing in the king crab capital of the world. I was not going to walk past it to go find a sandwich.

It was outstanding. Sweet, firm, faintly briny, nothing like the watery stuff that shows up in a grocery-store steam tray. I ate it slowly, which at that price is less discipline than arithmetic.

And then, because this is what I do now, I went back and looked up exactly what I'd just eaten.

What's actually in it

Here's the profile for a 3-ounce serving of cooked king crab leg meat — roughly a modest portion, and considerably less than what I put away in Ketchikan:

Nutrient	Amount	% Daily Value
Calories	~82	—
Protein	~16 g	~32%
Fat	~1.3 g	~2%
Vitamin B12	~9 µg	~370%
Copper	~1 mg	~110%
Selenium	~35 µg	~65%
Zinc	~6 mg	~55%
Omega-3 (EPA+DHA)	~350–400 mg	—
Sodium	~900 mg	~39%

Read that top section again. Sixteen grams of protein for eighty-two calories.

That is one of the best protein-to-calorie ratios in the entire food supply. Better than chicken breast. Far better than steak. You would have to eat roughly twice the calories in salmon to get the same protein.

Why this matters more after 60 than it did at 40

Protein density fights the thing that actually takes people down. Not heart disease, not cancer — frailty. Sarcopenia, the age-related loss of muscle mass, is the single strongest modifiable predictor of whether you stay independent in your eighties. Older adults also absorb and use dietary protein less efficiently than young adults, which means the requirement goes up right when appetite goes down. A food that delivers maximum protein per calorie is solving exactly that problem.

Selenium runs your antioxidant machinery. It's not an antioxidant itself — it's the cofactor for glutathione peroxidase and the thioredoxin reductase system, which are the enzymes your cells use to handle oxidative damage. It's also required to convert T4 into active T3 thyroid hormone. One serving covers roughly two-thirds of the daily requirement.

B12 at 370% isn't overkill — it's insurance. Stomach acid production and intrinsic factor both decline with age, so B12 absorption gets worse exactly when you need it. Adequate B12 supports homocysteine clearance, and elevated homocysteine tracks with both cardiovascular events and cognitive decline. Density matters here in a way it simply doesn't at 30.

Zinc and copper arrive together, in balance. Zinc supports thymic function and immune competence, both of which fall off a cliff with age. But here's the part most people miss: zinc supplements taken alone can drive copper deficiency, because the two compete for absorption. Crab delivers both in roughly the ratio your body wants. This is the argument for food over pills in miniature.

Low mercury. Crab sits at the low end of the marine spectrum. Unlike tuna or swordfish, there's no accumulation ceiling forcing you to limit how often you eat it. (The price will handle that for you.)

The honest caveats

I'm not going to sell you crab legs as a superfood without the fine print.

Sodium is the real limiting factor. That 900 mg per 3 oz is not a small number, and a full leg cluster can push 1,500–2,000 mg. King crab is brine-cooked at sea, and the salt is in the meat. If you track blood pressure — and at our age you should — rinse the meat and go easy on the butter. Skip the salted butter entirely.
Purines are moderate-to-high. If you have any gout history or an elevated uric acid on your bloodwork, this is a food to enjoy occasionally rather than build a habit around.
Cadmium concentrates in the hepatopancreas — the yellow-brown “mustard” in the body cavity. It does not meaningfully accumulate in the leg meat. Eat the legs. Skip the paste. This is a real distinction, not a squeamishness thing.
Cholesterol runs about 45 mg per 3 oz, which for the large majority of people is nutritionally irrelevant. If you're one of the minority who are genuine dietary cholesterol hyper-absorbers, you already know it from your panel.

Crab versus salmon: not a fair fight, in both directions

Crab wins decisively on protein-per-calorie and on mineral density — the selenium, zinc, copper, and B12 numbers are hard to beat.

Crab loses badly on omega-3s. That 350–400 mg of EPA+DHA is roughly a quarter of what you'd get from an equivalent serving of wild salmon.

So it's a complement, not a substitute. If you're eating king crab instead of fatty fish, you're trading away the omega-3s that do the anti-inflammatory and cognitive work. Eat both. Just not both at $100 a leg.

Was it worth a hundred dollars?

Nutritionally? No. I can hit every one of those numbers for eight dollars with a can of sardines and a handful of oysters, and I frequently do.

But that's not what I bought. I bought a king crab leg pulled out of Alaskan water, eaten in Ketchikan, on a trip I'll remember. The nutrition was a bonus I looked up afterward.

Longevity isn't just about the number of years. If you optimize every single input and never once eat the ridiculous thing in the beautiful place, you're not extending your life — you're just extending the spreadsheet.

Buy the crab leg. Rinse off some of the salt. Skip the mustard.

If you want to see the rest of what I’m doing, it’s all public: my protocols, my fitness routine, and my test results.

Stay sovereign, stay healthy.

I'm not a physician and nothing here is medical advice. Talk to your doctor before making changes to your diet, especially if you have hypertension, gout, or kidney concerns.