They're often right next to each other on the supermarket shelf: raw and roasted nuts. But what actually changes during roasting, and which variant is really healthier?
What changes during roasting?
On the nutrition label, raw and roasted nuts hardly differ. Calorie, fat and protein content increase only slightly during roasting because moisture is removed from the nut, concentrating the nutrients into less weight.
What happens to vitamins and antioxidants?
This is where the real difference shows up: heat-sensitive vitamins like vitamin E, thiamine and some carotenoids are partly lost during roasting. At the same time, the roasting reaction also creates new compounds with antioxidant effects, so the impact varies depending on the nutrient. From a purely nutritional standpoint, raw nuts come out minimally ahead, though the difference is fairly negligible in everyday life.
Taste, digestibility and use in the kitchen
The clearest difference lies in taste: roasting intensifies aroma and roasted notes and makes nuts crunchier, while raw nuts are milder and have a bit more bite. For some people, roasted nuts are also somewhat easier to digest. In the kitchen, raw nuts are good for blending, for example for nut butter or baked goods, while roasted nuts develop their roasted flavors best eaten plain as a snack or as a topping.
Bottom line: there's no clear "healthier" or "unhealthier," it's more a question of taste and intended use. Both variants provide the valuable fats, proteins and nutrients that make nuts so special.