Quick Answer
One ounce of raw almonds (28 g, about 23 nuts) contains roughly 164 calories on the label, 14.2 g of fat, 6 g of protein, 6.1 g of carbohydrate and 3.5 g of fibre. But USDA research found the body actually absorbs closer to 129 calories from whole almonds, because their rigid cell walls trap some of the fat and it passes through undigested. The standout nutrient is vitamin E at roughly half a day’s requirement per ounce, followed by magnesium, riboflavin, copper and manganese. Almonds are not a low-calorie food, not a meaningful calcium source, and the sweet almonds sold in shops carry no cyanide risk.
Almond Nutrition Facts
Raw almonds, calculated from USDA FoodData Central and rounded.
| Nutrient | 1 oz (28 g, ~23 almonds) | %DV | Per 100 g |
|---|---|---|---|
| Calories (label) | 164 | – | 579 |
| Calories absorbed (measured) | ~129 | – | ~455 |
| Total fat | 14.2 g | 18% | 49.9 g |
| Saturated fat | 1.1 g | 6% | 3.8 g |
| Monounsaturated fat | 9.0 g | – | 31.6 g |
| Polyunsaturated fat | 3.5 g | – | 12.3 g |
| Cholesterol | 0 mg | 0% | 0 mg |
| Sodium (raw, unsalted) | 0.3 mg | 0% | 1 mg |
| Total carbohydrate | 6.1 g | 2% | 21.6 g |
| Dietary fibre | 3.5 g | 13% | 12.5 g |
| Sugars | 1.2 g | – | 4.4 g |
| Protein | 6.0 g | 12% | 21.2 g |
| Vitamin E | 7.3 mg | ~49% | 25.6 mg |
| Copper | 0.29 mg | ~32% | 1.03 mg |
| Manganese | 0.62 mg | ~27% | 2.18 mg |
| Riboflavin (B2) | 0.32 mg | ~25% | 1.14 mg |
| Magnesium | 76 mg | 18% | 270 mg |
| Phosphorus | 136 mg | 11% | 481 mg |
| Calcium | 76 mg | 6% | 269 mg |
| Iron | 1.05 mg | 6% | 3.71 mg |
| Potassium | 208 mg | 4% | 733 mg |
| Vitamin A, vitamin C | 0 | 0% | 0 |
Two things to flag. Raw almonds contain essentially no sodium — figures above 100 mg per ounce describe salted roasted nuts, not raw ones, and that distinction gets lost constantly. And almonds are not a low-calorie food. At 579 calories per 100 g they are among the more energy-dense things you can eat. The case for them rests on nutrient density and satiety, not on being light.
The Calorie Finding Most Pages Miss
This is the single most interesting thing about almonds, and it comes from the USDA itself rather than a supplement company.
Food labels calculate calories using Atwater factors, a formula from the early twentieth century that assumes near-complete digestion. Researchers at the USDA’s Beltsville Human Nutrition Research Center tested that assumption directly by feeding people measured amounts of almonds under supervision and measuring the energy that actually stayed in the body.
The measured figure was 129 calories per 28 g serving, against 168 to 170 calculated by the Atwater method. The reason is structural: almond cell walls are rigid and fibrous, and intact cells full of fat pass through the digestive tract without being fully broken down. Researchers found those cells in participants’ stool with the fat still inside.
Walnuts and pistachios showed the same effect at smaller magnitudes, but almonds had the widest measured gap of the nuts tested.
The practical consequence is that form matters. The more intact the almond when you swallow it, the more calories escape digestion. Grinding does the work your teeth and gut would otherwise fail to do, which means:
- Whole almonds, chewed coarsely — the largest share of calories escapes absorption.
- Almond butter and almond flour — the cell walls are already broken, so absorption is closer to the label figure.
- Almond milk — a different product entirely, mostly water, and usually far lower in everything including protein.
None of this makes almonds a free food. The absorbed calories are real. But it does explain a long-standing observation that people who eat nuts regularly do not gain the weight the arithmetic predicts.
What Almonds Are Genuinely Good For
- Vitamin E. The headline nutrient by a distance. One ounce supplies roughly half the Daily Value, which makes almonds one of the best whole-food sources available. Vitamin E is a fat-soluble antioxidant that protects cell membranes from oxidative damage.
- Copper and manganese. Around a third and a quarter of the Daily Value respectively, and both are rarely discussed.
- Riboflavin. About a quarter of the Daily Value per ounce, which is substantial for a food that is not dairy.
- Magnesium. 18 percent per ounce. Magnesium is involved in hundreds of enzymatic reactions, and many people fall short of the recommended intake.
- Fibre. 3.5 g per ounce, 13 percent of the Daily Value, which is more than most snack foods deliver.
- Satiety. The combination of fat, fibre and protein makes almonds genuinely filling, which is the mechanism behind their reputation in weight management rather than any metabolic effect.
What almonds are not is a calcium source. An ounce supplies 76 mg, about 6 percent of the Daily Value. Describing almonds as one of the best sources of calcium is simply wrong — a cup of milk delivers roughly four times as much, and fortified plant milks, tofu set with calcium sulphate and tinned sardines all beat almonds comfortably.
Health Claims: What Holds Up and What Does Not
| Claim | Where it stands |
|---|---|
| Lowers LDL cholesterol | Reasonably supported. Nut consumption, almonds included, is associated with modest LDL reductions in controlled trials. |
| Raises HDL cholesterol | Not supported. The LDL finding gets routinely paired with an HDL claim that the evidence does not carry. |
| Blunts the blood glucose rise of a meal | Plausible and modestly supported. Fat, fibre and protein slow gastric emptying. This is not a treatment for diabetes. |
| Helps with weight management | Supported indirectly, through satiety and incomplete calorie absorption rather than any effect on metabolism. |
| Prevents osteoporosis and fractures | Not supported, and it rests on the false premise that almonds are calcium-rich. |
| Prevents cognitive decline | Not supported. Almonds contain riboflavin, but the L-carnitine content is negligible and no trial shows an effect on cognition. |
| Prevents split ends and promotes hair growth | Not supported by any clinical evidence. |
| Reduces cancer risk | Not supported. No single food has been shown to reduce cancer risk. |
| Treats arthritis or Crohn’s disease | Not supported. Whole nuts can be poorly tolerated during an inflammatory bowel disease flare, so anyone with IBD should follow their own clinician’s advice. |
The honest version: almonds are a nutrient-dense whole food with a decent evidence base for cholesterol and satiety, and a great deal of marketing attached to everything else.
Do Almonds Contain Cyanide?
This claim circulates widely and deserves a direct answer, because in the form it is usually repeated it is wrong and needlessly frightening.
There are two varieties. Sweet almonds (Prunus dulcis var. dulcis) are what supermarkets sell. Bitter almonds (var. amara) look nearly identical but contain the cyanogenic glycoside amygdalin at vastly higher concentrations, which releases hydrogen cyanide when chewed.
The gap is not marginal. In FDA laboratory work investigating bitter almonds found in imported product, control bitter almonds measured 1.4 mg of cyanide per gram and 20 to 25 mg of amygdalin per gram, while sweet almonds tested negative for both at detection limits of 4 micrograms of cyanide and 200 micrograms of amygdalin per gram.
So: eating a large quantity of ordinary sweet almonds does not cause cyanide poisoning. There is no realistic threshold at which snacking almonds become toxic. Raw bitter almonds are a genuine hazard and are restricted from sale for direct consumption in the US, the UK and most other countries for exactly that reason. The same caution applies to raw apricot kernels, which food safety agencies advise against eating.
The practical rule is the taste. An intensely bitter almond should be spat out rather than swallowed. A normal-tasting almond is a sweet almond.
Who Should Be Careful
- Tree nut allergy. This is the one genuinely serious risk and it deserves more than a passing mention. Almond allergy can cause anaphylaxis, which is a medical emergency. Anyone diagnosed needs strict avoidance, needs to check labels for precautionary “may contain” wording, and should carry prescribed adrenaline. Almond is one of the tree nuts that must be declared on US labels.
- A history of calcium oxalate kidney stones. Almonds are among the higher-oxalate foods, so intake is worth discussing with your clinician or a renal dietitian if you are a stone former.
- Anyone watching sodium. The nut is not the problem; the salt on roasted nuts is. Raw or dry-roasted unsalted almonds sidestep it entirely.
- Anyone counting calories carefully. A handful is easy to turn into three handfuls. Portioning into a bowl rather than eating from the bag is the practical fix.
- Young children. Whole nuts are a choking hazard. Nut butters or ground almonds are the usual alternative.
How Many Almonds a Day?
There is no official recommended daily intake of almonds specifically. The one-ounce serving, about 23 nuts, is simply the standard reference amount used on nutrition labels — it is a measuring unit, not a prescription.
That said, an ounce a day is a sensible and well-studied amount. It delivers half a day’s vitamin E and meaningful magnesium, copper and fibre, for a real cost of roughly 129 absorbed calories. More than that is not harmful, it simply adds up in energy terms. There is no toxicity ceiling to worry about, and no evidence that a specific time of day changes absorption or “boosts metabolism”.
If you want to see how almonds fit against the rest of what you eat, our guide to reading nutrition labels covers serving sizes and %DV.
Frequently Asked Questions
The label figure is about 164 calories per ounce (28 g, roughly 23 almonds), or 579 per 100 g. However, USDA research measured the calories people actually absorb from whole almonds at about 129 per ounce, because the rigid cell walls trap fat that passes through undigested. Almond butter and almond flour, where the cells are already broken open, absorb closer to the label figure.
Sweet almonds, the variety sold in shops, do not in any amount that matters. In FDA laboratory work, control bitter almonds measured 1.4 mg of cyanide and 20 to 25 mg of amygdalin per gram, while sweet almonds tested negative for both at the detection limits used. Bitter almonds are a genuine hazard and are restricted from sale for direct consumption in the US, UK and most other countries. Eating a large quantity of ordinary almonds does not cause cyanide poisoning. If an almond tastes intensely bitter, spit it out.
There is no official recommendation for almonds specifically. The one-ounce serving of about 23 almonds is the standard reference amount used on nutrition labels, not a prescribed dose. An ounce a day is a sensible, well-studied amount that supplies roughly half the Daily Value for vitamin E plus useful magnesium, copper and fibre, for about 129 absorbed calories. Eating more is not toxic; it simply adds energy.
Vitamin E is the standout, at roughly 49 percent of the Daily Value per ounce, which makes almonds one of the best whole-food sources. Copper follows at about 32 percent, manganese 27 percent, riboflavin 25 percent, magnesium 18 percent and fibre 13 percent. Almonds are not a meaningful calcium source despite frequent claims to the contrary: an ounce supplies 76 mg, about 6 percent of the Daily Value.
No. At 579 calories per 100 g they are among the more energy-dense foods available, and describing them as low-calorie is inaccurate. What makes them useful for weight management is satiety from the combination of fat, fibre and protein, plus the fact that whole almonds deliver fewer absorbed calories than the label suggests. Neither of those makes the food low in calories.
Raw almonds contain essentially none, about 0.3 mg per ounce. Salted roasted almonds are a different product and commonly carry 100 to 200 mg per ounce depending on the brand. Any figure above 100 mg per ounce is describing salted nuts, not raw ones, and this distinction is frequently lost. Dry-roasted unsalted almonds give you the roasted flavour without the sodium.
There is reasonable evidence that nut consumption, almonds included, produces modest reductions in LDL cholesterol in controlled trials. The commonly paired claim that almonds raise HDL cholesterol is not supported by the evidence. Almonds are a reasonable component of a heart-healthy eating pattern rather than a treatment, and anyone managing raised cholesterol should follow their clinician’s guidance.
Botanically, no. Almonds are the seed of a drupe, a fruit with a stone at its centre, which makes them closer relatives of peaches and cherries than of true nuts such as hazelnuts and chestnuts. Culinarily and for allergy labelling purposes they are treated as tree nuts, and anyone with a tree nut allergy should treat them as such.
No. There is no evidence that the body absorbs nutrients from almonds better in the morning, or that eating them at a particular time boosts metabolism. Eat them when they fit your day. What does measurably change absorption is the form: whole almonds deliver fewer absorbed calories than almond butter or almond flour, because grinding breaks open the cell walls.
Related Reading
- How to read nutrition labels to make smarter food choices
- Whole milk nutrition facts and how it compares
- Balancing protein, carbs and fats
- How to spot a fad diet: red flags and the real evidence
Sources
- USDA FoodData Central, for raw almond nutrient values.
- USDA Agricultural Research Service, Going Nuts Over Calories, on the measured metabolizable energy of almonds, walnuts and pistachios.
- USDA AgResearch Magazine, on Baer and Novotny’s bioavailability studies.
- Cyanide and Amygdalin as Indicators of the Presence of Bitter Almonds in Imported Raw Almonds, FDA laboratory investigation.
- UK Food Standards Agency, advice on the sale of apricot kernels and bitter almonds.
- US FDA, Daily Value on the Nutrition and Supplement Facts Labels.
Last reviewed and rewritten September 2026. Nutrient values are calculated from USDA FoodData Central and rounded; roasted, salted and flavoured almonds differ substantially, so the panel on the pack is the authority for that product. This article is general information, not medical or dietetic advice. If you have a tree nut allergy, a history of kidney stones, inflammatory bowel disease, or are managing cholesterol or diabetes, follow the guidance of your doctor or registered dietitian. Suspected anaphylaxis is a medical emergency. How we research and check this content is described in our editorial process and sources cited policy.
