Walnut

The walnut is the nut richest in plant-based omega-3s (ALA): 65 g of fat per 100 g (698 kcal), with 15 g of protein and fibre. Very energy-dense, it is a distinctive healthy-fat source, useful for fat balance.

Its calorie density means measuring: a small handful is enough.

A handful (~30 g, i.e. 4-5 whole halves) provides healthy fats for ~200 kcal. When bulking, it easily enriches a meal; when cutting, measure it as calories climb fast.

Crushed over a porridge, fromage blanc or salad, it adds crunch, omega-3s and satiety. Preferably plain, with no added salt or sugar.

The walnut's omega-3 is ALA, a plant omega-3. The body converts it into EPA and DHA (the active forms found in oily fish), but with low efficiency. In other words, the walnut is a good healthy-fat source, but it does not fully replace oily fish for omega-3s.

It stays valuable, especially in vegetarian eating: combine it with other ALA sources (flaxseed, rapeseed) and, if you do not eat fish, an algae-based omega-3 supplement can top up EPA/DHA.

For 100 g of walnuts you get 698 kcal, 15 g of protein, 5 g of carbs, 65 g of fat and 6 g of fibre. Almost all the energy therefore comes from fat, mostly polyunsaturated fat. A 30 g portion provides about 209 kcal, 4.5 g of protein, 19.5 g of fat and nearly 2 g of fibre. Fifteen grams, or two to three halves, already represent around a hundred calories.

These figures show why the scale is your ally: walnuts are a dense food, and the eye easily underestimates a handful. Weighing the portion once and then reproducing it identically is enough to keep your calorie budget under control without mental effort.

When bulking, the walnut is a practical tool to raise calories without enlarging the plate. Add 30 to 40 g to a porridge, a yogurt or a shake and you gain over 200 kcal of healthy fats. That helps when appetite is limited. It is not a major protein source, however: it complements, and does not replace meat, eggs or dairy.

When cutting, keep them, but sparingly: 15 to 20 g are often enough to enjoy the crunch and the essential fats without derailing your deficit. They are quite satiating, which can help you last between meals, provided you do not snack straight from the bag.

The polyunsaturated fats in walnuts oxidise easily, which is what makes them fragile. Choose walnuts with a light, uncracked shell, or shelled halves in opaque, sealed packaging with a distant expiry date. A walnut that smells of old cardboard or paint, or tastes bitter and sharp, is rancid and should be thrown away.

Store the halves in an airtight container, in a cool place away from light, or in the fridge or even the freezer if you buy in bulk. In the shell they last much longer. Rather buy small amounts that you finish within a few weeks.

Beyond porridge, walnuts slip in everywhere: crushed into a spinach salad, blended into a sauce, mixed into fromage blanc or added to a dried-fruit mix. On the site they appear in the Greek yogurt with honey and walnuts, the Apple cinnamon porridge and the Apple Bircher muesli, three easy breakfasts that benefit from their crunch.

They also work with savoury dishes, for example the Grilled turkey breast with spinach, where a few crushed halves bring contrast and quality fats. For a more pronounced crunch, you can dry-toast them for a few minutes in a pan, watching so they do not burn.

The first mistake is snacking without weighing: a handful "by eye" can easily reach 60 g, or over 400 kcal. The second is choosing sugar-coated, caramelised or salted versions, which lose the nutritional appeal of plain walnuts. The third is believing they replace oily fish for omega-3s, which is inaccurate because of the low conversion of ALA.

Another point: walnuts are a common allergen. If you have a tree-nut allergy, avoid them entirely. And remember that their quality is also judged by freshness: a rancid walnut no longer brings anything good.