Nuts and seeds are the default keto snack, and for good reason: they travel well, need no cooking, and feel like a treat. But they are not interchangeable. Some are genuinely low in carbohydrate and easy to keep within bounds, others creep up fast, and a few are high enough that a generous handful can nudge you out of ketosis without you noticing. They also share one quiet trap that catches almost everyone. Here is how to use them well.
Why nuts are not the free food they seem
The thing about nuts is that they are easy to eat without thinking. They are moreish, calorie-dense, and come in a bowl you keep returning to during a film. A portion of nuts is genuinely small, roughly a closed handful, around 30 grams, yet almost nobody stops there. The carbs in a single sensible portion are usually fine; the carbs in the four absent-minded portions you actually ate are not. So before any league table of which nut beats which, the most useful habit is to decant a portion into a small bowl and put the bag away. Eaten from the bag, even the best nut becomes a problem.
There is a second reason to respect the portion. Nuts are very calorie-dense, and while keto is not primarily about counting calories, a daily mountain of cashews and almond butter is a common, invisible reason that fat loss stalls. If your weight has parked itself, the snacking nuts are one of the first places to look. Our piece on why the scales stop moving covers the other usual suspects.
The lowest-carb nuts, worth leaning on
If you want nuts you can eat fairly freely within a sensible portion, these are the ones. Figures are rough net carbs per 30 grams.
- Macadamias (about 1.5g): the keto favourite, very high in fat, very low in carbs, gentle on the count.
- Pecans (about 1g): one of the lowest of all, buttery and rich.
- Brazil nuts (about 1.3g): very low carb and notably high in selenium, so a couple a day go a long way; you do not need many.
- Walnuts (about 2g): low carb and a rare plant source of omega-3 fats, which tilts their fat profile in a friendlier direction.
These four are the backbone of nut snacking on keto. They are high in fat, low in carbohydrate, and forgiving if your portion control is imperfect.
The middle tier, fine in measured amounts
- Hazelnuts (about 2g) and almonds (about 2.5g) are perfectly keto-friendly in a real portion. Almonds are the most common keto nut because almond flour underpins so much low-carb baking, but whole almonds are easy to over-pour, so the small-bowl rule matters here.
- Pine nuts and peanuts (around 3 to 4g) sit at the edge. Peanuts are technically a legume rather than a nut, and while they fit keto in moderation, they are easier to overdo than the nuts above.
The ones to keep small or skip
- Cashews (about 7 to 8g net carbs per 30g): noticeably starchy, and a handful or two can eat a large slice of your daily carb budget. Enjoy them occasionally and weigh them, or leave them for now.
- Pistachios (about 5g, and never just one): low-ish per nut but almost impossible to portion, because the shelling ritual keeps you going. The combination is what makes them risky.
- Chestnuts are not really in the same category at all; they are starchy and far too high in carbohydrate for keto.
None of these are forbidden, but they are the ones to count rather than graze.
Seeds, the underrated half
Seeds get less attention than nuts and deserve more. They are cheap, lower in calories per portion, and several bring fibre and minerals that are genuinely useful on keto.
- Chia seeds and flaxseed (ground) are very high in fibre, so their net carbs are low, and both help with the sluggish digestion some people hit early on keto. Ground flax also adds omega-3 fats. A tablespoon of chia in cream or yoghurt makes a quick pudding.
- Pumpkin seeds are a good source of magnesium, a mineral keto bodies lose readily, which makes them a sensible small daily habit alongside getting your electrolytes properly sorted.
- Sunflower seeds are fine in moderation but easy to overeat, much like nuts.
- Hemp seeds are quietly excellent: high in protein and fat, very low in net carbs, and pleasant stirred through almost anything.
The omega-6 question, in plain terms
You may have read that nuts are high in omega-6 fats and therefore inflammatory. It is worth understanding rather than panicking over. Many nuts and seeds, particularly almonds, peanuts and sunflower seeds, are rich in omega-6 linoleic acid. A diet heavily skewed towards omega-6 with little omega-3 is associated with more inflammation, so the concern is about balance, not about nuts being poison. In practice the fix is simple: do not make sunflower seeds and peanut butter the bulk of your fat intake, lean on the lower-omega-6 choices like macadamias and pecans, include omega-3 sources such as walnuts, ground flax and oily fish, and you have nothing to worry about. The same logic runs through our look at fats worth cooking with.
Nut butters and the label trap
Nut butters are convenient and keto-friendly in principle, but the jar is where carbs hide. Read the ingredients: you want nuts and perhaps salt, nothing else. Many supermarket peanut and almond butters add sugar, palm oil or, worse, are sweetened with honey or maltodextrin. The same goes for flavoured and roasted snack nuts, which are often dusted with starchy or sugary coatings. Plain, raw or dry-roasted, single-ingredient products are what you want. And the portion trap is sharper with butters than with whole nuts, because a tablespoon disappears in seconds; measure it rather than eating from the jar with a spoon.
A sensible way to use them
Treat nuts and seeds as a seasoning and an occasional snack rather than a meal you graze towards all day. Keep macadamias, pecans, walnuts and a bag of mixed seeds as your staples. Portion into a small bowl, never eat from the bag, and weigh the starchier ones like cashews if you want them. Use seeds to plug the gaps nuts leave, fibre, magnesium, omega-3, and read every butter label. Done that way they are one of the most genuinely useful additions to a keto kitchen. Grazed mindlessly, they are one of the quietest reasons people stall.
This is general information about the ketogenic diet, not medical advice. Keto does not suit everyone; if you are pregnant, on medication, or managing a condition such as diabetes, speak to a doctor or dietitian first.