was sind komplexe kohlenhydrate — what are common causes?

Complex carbohydrates are long-chain sugars (polysaccharides) such as starch and fiber, found in whole grains, legumes, vegetables, and fruits. They are digested more slowly than simple sugars, leading to a more stable blood glucose level and sustained energy. Common causes of low intake of complex carbohydrates include a diet high in processed foods, refined sugars, and ready meals that are low in fiber. Additionally, restrictive diets like low-carb or keto often reduce consumption of these nutrient-dense foods. Insufficient complex carbohydrate intake can contribute to constipation, blood sugar fluctuations, and over time, an increased risk of metabolic disorders. The evidence for these effects is strong (human epidemiological and clinical studies). Note: The provided context (vitamin D test, DNA tests) is not directly relevant; this answer is based on general nutritional science.