Eating bone marrow gives you a rich, calorie-dense food that supplies mostly fat (largely monounsaturated), small amounts of protein, some fat-soluble vitamins, iron and collagen-related compounds when cooked on the bone. Its realistic benefits are satiety, a flavorful source of energy and fat-soluble nutrients, and a contribution to the collagen building blocks your body uses for skin and joints. It is not a cure-all, and because a tablespoon of beef bone marrow carries roughly 110 calories and about 12 grams of fat, portion size matters more than for most foods.
As a hematologist, I spend my working life thinking about marrow as the organ that makes blood. This page looks at it as food: what it tastes like, how to cook and buy it, how it compares with bone broth, what the nutrition numbers really show, and which health claims hold up.
What Is Bone Marrow, and What Does It Taste Like?
Bone marrow is the soft tissue inside the hollow center of bones. In a living animal, red marrow makes red cells, white cells and platelets, while yellow marrow is mostly fat. The marrow you eat from beef leg bones (femur and shank) is almost all yellow marrow, which is why it is so rich.
Taste and texture: roasted marrow is mild, savory and buttery, with a gentle beefy sweetness. When cooked properly it has a soft, spreadable, almost custard-like texture that melts on warm toast. Overcooked marrow renders into liquid fat and loses that texture, so timing matters. People who dislike fatty cuts of meat often find it too rich; a squeeze of lemon, flaky salt and fresh herbs help balance it.
Beef marrow bones are the most widely sold, often labeled “marrow bones” or “soup bones”. Veal, lamb and bison marrow are also eaten; veal is milder and lamb bones are smaller.
Bone Marrow Nutrition Facts
Bone marrow is not a standard item in most national food tables, and its composition varies with the animal, the bone and how much fat renders out during cooking. The figures below are approximate values for beef marrow commonly quoted in food-composition references, shown per tablespoon, per 1 ounce (28 g) and per 100 g so you can compare it with other foods.
| Nutrient (beef marrow, approximate) | 1 tbsp (about 14 g) | 1 oz (28 g) | 100 g |
|---|---|---|---|
| Calories | about 110 kcal | about 220 kcal | about 785 kcal |
| Total fat | about 12 g | about 24 g | about 84 g |
| Protein | about 1 g | about 2 g | about 7 g |
| Carbohydrate | 0 g | 0 g | 0 g |
| Micronutrients | Small amounts of iron, vitamin A, vitamin E, riboflavin and other B vitamins; amounts vary widely | ||
Three points stand out. Marrow is energy-dense, with more calories per gram than butter. Most of its fat is monounsaturated, mainly oleic acid, the same fatty acid that dominates olive oil, although it also contains saturated fat and cholesterol. And its protein content is low; the “collagen” in marrow dishes comes largely from the bone and connective tissue around it, especially when bones are simmered.
Health Benefits of Eating Bone Marrow
1. Energy and satiety
Fat slows stomach emptying and triggers fullness hormones such as cholecystokinin. A small serving of roasted bone marrow is filling, which can help some people eat less overall when it replaces, rather than adds to, other rich foods.
2. A source of monounsaturated fat
Diets where monounsaturated fat replaces saturated fat are associated with healthier cholesterol profiles. Marrow’s oleic acid content makes it a better fat profile than many people expect from an animal food, but it is still a concentrated source of calories and some saturated fat, so it belongs in the “occasional rich food” category.
3. Collagen building blocks for skin and joints
Collagen is the main structural protein of skin, tendons, cartilage and bone. When marrow bones are roasted or simmered, collagen from the bone and connective tissue breaks down into gelatin, which supplies the amino acids glycine, proline and hydroxyproline. Your body uses these, along with vitamin C, to build its own collagen, which supports skin elasticity and connective tissue. Eating collagen does not deliver collagen directly to your skin; it is digested into amino acids first, so think of it as supplying raw material rather than a targeted skin treatment.
4. Joint support
Bone and cartilage contain glucosamine and chondroitin, the compounds sold as joint supplements. Bone-based dishes, especially long-simmered broth, provide small amounts. Evidence for these compounds easing joint pain is mixed even in supplement form, so marrow is best seen as part of a nourishing diet rather than an arthritis treatment.
5. Fat-soluble vitamins
Marrow contains some vitamin A and vitamin E, and its fat helps you absorb fat-soluble vitamins from other foods eaten with it, such as a salad of leafy greens. Grass-fed animals tend to have a slightly more favorable fatty acid profile, including more conjugated linoleic acid (CLA) and omega-3s, though marrow is not a major source of either.
6. Iron
Marrow supplies a modest amount of iron. Animal foods provide heme iron, which is absorbed more efficiently than the non-heme iron in plants. Lean red meat, liver and shellfish are far richer sources, so marrow is a minor contributor rather than a way to treat iron deficiency.
7. Adiponectin and weight-related disease risk
Bone marrow fat tissue produces adiponectin, a hormone that improves insulin sensitivity and is linked with lower risk of type 2 diabetes and heart disease. Some articles suggest eating marrow raises adiponectin. That leap is not established: adiponectin is a protein, and like other dietary proteins it is broken down during digestion rather than absorbed intact. The hormone matters for the marrow inside your body, not the marrow on your plate.
8. Gut support
Gelatin-rich broths are easy to digest and are traditionally used during illness and recovery. Glycine and glutamine support the cells lining the gut, but claims that marrow or broth “heals a leaky gut” go beyond what has been shown in people.
For a broader look at diet and the blood-forming organ, see the role of whole foods in supporting bone marrow health.
How to Cook Bone Marrow
Choosing the cut
Canoe-cut bones are split lengthwise, exposing a long strip of marrow that is easy to scoop and looks impressive on a plate. Cross-cut bones are sliced into rounds about 2 to 3 inches tall; they are cheaper, easier to find and ideal for broth. Ask for center-cut femur or shank bones, which hold the most marrow.
Step-by-step roasting
- Heat the oven to 450°F (230°C). If the bones are frozen, thaw them in the refrigerator first.
- Pat the bones dry and place them marrow-side up (canoe cut) or standing upright (cross cut) on a foil-lined tray. Season lightly with salt.
- Roast until the marrow is soft all the way through, lightly browned on top and just beginning to bubble and pull away from the bone.
- Rest for a couple of minutes, then scoop the marrow out with a small spoon.
- Serve on toasted bread with flaky salt, lemon and a parsley-shallot salad to cut the richness.
| Cut | Oven temperature | Approximate time | Done when |
|---|---|---|---|
| Canoe-cut (split lengthwise) | 450°F (230°C) | 15–20 minutes | Marrow soft, golden on top, gently bubbling |
| Cross-cut, 2 inches tall | 450°F (230°C) | 15–20 minutes | Marrow soft through the center, edges pulling away |
| Cross-cut, 3 inches tall | 450°F (230°C) | 20–25 minutes | A skewer slides through with no resistance |
Check early the first time you cook marrow. Bones vary in size, and the difference between spreadable and melted into a pool of fat can be only a few minutes.
Other ways to eat bone marrow
- Broths and soups: simmer cross-cut bones for several hours for a rich stock; see our notes on a bone marrow broth recipe.
- Sauteing: use scooped marrow in place of butter or oil to cook vegetables, eggs or mushrooms.
- Sauces: whisk a spoonful into a pan sauce or red wine sauce for body and gloss.
- Spreads: blend soft marrow with herbs and garlic for a compound “marrow butter” to top steak or toast.
- Mixed into ground meat: some butchers blend marrow into burger meat for extra richness.
Bone Marrow vs Bone Broth: Which Should You Choose?
They come from the same bones but deliver very different things. Marrow is the fat inside the bone; broth is water that has extracted gelatin, minerals and flavor from bones and connective tissue over a long simmer, with much of the fat often skimmed off.
| Feature | Roasted bone marrow | Bone broth |
|---|---|---|
| Main component | Fat | Water, gelatin, minerals |
| Calories per typical serving | High (about 110 kcal per tablespoon) | Low (usually well under 100 kcal per cup) |
| Collagen and gelatin | Low on its own | Higher, especially from joints and knuckle bones |
| Fat-soluble vitamins | Present | Minimal if the fat is skimmed |
| Sodium | Only what you add | Can be high in store-bought broths |
| Best use | An occasional rich appetizer or cooking fat | Daily sipping, soups and a gentle food during illness |
Neither is simply “healthier”. If you want collagen building blocks with few calories, choose broth. If you want satiety and flavor from a small portion, choose marrow. Many people get the best of both by simmering roasted marrow bones into broth.
Where to Buy Marrow Bones and How to Choose Them
A local butcher is the best source: you can ask for canoe-cut or cross-cut bones, center-cut pieces with plenty of marrow, and bones from grass-fed animals. Many supermarkets stock frozen marrow or soup bones, and farm shops and online meat suppliers sell them too.
- Look for bones with a large, visible core of pale, creamy marrow and no gray discoloration.
- Choose bones from reputable sources; grass-fed and pasture-raised options are widely available.
- Fresh bones keep for a few days in the refrigerator; freeze them if you will not cook them soon.
How Much Bone Marrow Should You Eat?
Portion size
A sensible serving is about one to two tablespoons of marrow, roughly what you get from one or two canoe-cut halves. At around 110 calories per tablespoon, that is a similar energy load to a tablespoon of butter or olive oil. Treat it as a rich treat or cooking fat a few times a week rather than a daily staple, unless your overall diet has room for it.
Who should be cautious
- People with high LDL cholesterol or heart disease: marrow contains saturated fat and cholesterol; keep portions small and check your lipid panel.
- People with gout: long-simmered bone broths contain purines, which can trigger flares.
- People managing weight or diabetes: the calorie density adds up quickly.
- People sensitive to histamine: long-simmered broth may cause symptoms.
Bones can accumulate small amounts of heavy metals over an animal’s life, which is another reason to buy from reputable suppliers and eat marrow in moderation.
When to See a Doctor
Bone marrow is a food, not a medicine. If you are eating it to fix a health problem, get the problem assessed first. Ask your doctor about a complete blood count and iron studies if you suspect anemia, a lipid panel if you have cholesterol concerns, and uric acid testing if you have had gout. Unexplained fatigue, pallor, easy bruising or joint swelling deserve medical evaluation, not a dietary fix.
Frequently Asked Questions
What does bone marrow taste like?
Roasted bone marrow tastes buttery, savory and mildly beefy, with a soft, spreadable texture. It is very rich, so it is usually served with something sharp, such as lemon, pickled onions or a parsley salad.
How do you cook bone marrow?
The simplest method is roasting canoe-cut or cross-cut bones at 450°F (230°C) for about 15–20 minutes, until the marrow is soft and just bubbling. You can also simmer bones for broth, saute with scooped marrow, or stir it into sauces.
Is bone marrow good for weight loss?
Not directly. It is filling, which can help if a small portion replaces other rich foods, but it is one of the most calorie-dense foods you can eat. For weight loss, keep servings small and count it as part of your fat intake.
Is bone marrow healthier than bone broth?
They serve different purposes. Broth is low in calories and higher in gelatin; marrow is high in fat and calories but more satiating and flavorful. For daily use, broth is the easier fit; marrow works best as an occasional food.
Does bone marrow affect blood pressure?
Plain marrow is naturally low in sodium, so it is unlikely to raise blood pressure on its own. The salt you add, salty toast and store-bought broths are the usual sodium sources. Its saturated fat and calories matter more for overall heart health than for blood pressure directly.
Are bone marrow supplements as good as eating it?
Freeze-dried marrow powders and capsules exist, but there is little good evidence for specific health benefits, and supplements are not regulated as strictly as medicines. Eating marrow as food gives you a known product; if you try supplements, choose reputable brands and tell your doctor.
Key Takeaways
- Bone marrow is mostly fat, largely monounsaturated, with about 110 calories per tablespoon.
- Real benefits are satiety, flavor, fat-soluble nutrients and collagen building blocks, especially when bones are cooked into broth.
- Roast canoe-cut or cross-cut bones at 450°F (230°C) for about 15–20 minutes until soft and bubbling.
- Choose broth for low-calorie collagen and marrow for a small, rich treat.
- Keep portions to one or two tablespoons, and be cautious with high cholesterol, gout or weight concerns.
