Hazelnuts have a high nutritional value. The treasure in the tree was hazelnut kernels from fruit nuts. Small power found supplies give a lot of energy: 650 kcal or 2720 kJ per 100 grams. Despite the high-fat content (hazelnuts contain about 45-75% fat), moderate consumption usually does not negatively affect body weight. On the one hand, this may be due to the fact that walnuts are very satisfying, on the other hand, because the ingredients included in their composition increase energy metabolism. All common types of hazelnuts are edible, including cork nuts. However, they tend to be smaller than the average hazelnut. In addition, the cork nut often contains fewer nuts. In general, hazelnuts are high in various vitamins and minerals. In particular, the following should be noted: Vitamin E: 100 grams of hazelnuts contain 24.5 mg of this vitamin. This vitamin has a cellular protective effect and is designed to fight skin aging and promote skin health. The anti-inflammatory effect of vitamin E also helps in this. 
Vitamin B3: Hazelnuts contain 1.42 mg of vitamin B3. Vitamin B3, also called niacin, is essential for skin, muscle and nerve regeneration. It also causes the formation of messenger substances in the brain. Vitamin B6: Vitamin B6 plays an important role in the metabolism of amino acids and therefore in the functioning of messengers such as histamine or serotonin. Vitamin B6 is also essential for the immune system. Vitamin B7: Also known as biotin, this vitamin plays an important role in the metabolism of carbohydrates, proteins, and fats. It is also said that biotin has a positive effect on the structure and growth of hair. Potassium: 100 grams of hazelnuts contain 795 mg of potassium. This mineral is essential for the transmission of electrical impulses between cells and nerves. Magnesium: Hazelnuts contain 163 mg of magnesium per 100 grams, magnesium is important for muscle function, strengthens the heart and bones. 
How many hazelnuts are useful? The German Nutrition Association recommends that adults eat about 25 grams of walnuts every day. In general, hazelnuts are very useful, however, like some other foods, they contain oxalic acid. As part of a balanced diet, an average of 50 to 200 mg of oxalic acid is consumed per day. For 100 grams of hazelnuts, there are from 167 to 222 milligrams. Therefore, they are considered foods with a high content of oxalates (more than 50 mg/100 g). However, there are foods with a much higher content. For comparison: rhubarb contains 460 mg per 100 grams, shatuto 650 mg. The acid reduces the absorption of minerals in the body and can lead to the formation of oxalic acid crystals. Excessive consumption of oxalic acid can lead to discoloration of the teeth and discomfort in the mouth. Long-term high consumption can lead to the formation of crystals in the kidneys. A large amount of oxalic acid can cause poisoning. 
However, if you follow the recommendations of the German Nutrition Association, there will be no adverse health effects from eating hazelnuts. Exceptions apply to people with kidney disease and allergies. Hazelnut: nut and pollen allergy Allergy to hazelnuts can manifest itself as an isolated allergy to nuts, that is, as a food allergy, or in combination with hay fever as a cross-allergy. Isolated nut allergy often results in severe allergic reactions (anaphylactic reactions). In severe cases, they can cause cardiac arrest. Mild allergic reactions may cause swelling or skin rash. In Germany, hazelnuts are the second most common cause of anaphylactic reactions after peanuts. Allergy-related symptoms are more pronounced in the case of cross-allergy. 
Because some pollen allergens are similar to food allergens, cross-allergies can occur in people with hay fever. Common triggers for hazelnut cross-allergy are alder, birch, or hazelnut pollen. Cross-allergy to hazelnuts is common, mainly due to burning or tingling in the mouth, but also due to coughing, stomach problems, or skin rashes. When hazelnuts are heated, the specific proteins that cause cross-sensitivity are destroyed to a large extent, so that, for example, after eating a hazelnut pie, there are often no symptoms. However, due to the severity of the allergy, care should be taken and, if necessary, a doctor should be consulted regarding consumption. For people with isolated nut allergies, the following applies in most cases: Processed hazelnuts can also cause an allergic reaction. Hazel blossom causing problems for many people with
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