Rohkosternährung: Vorteile, Risiken und Wissenschaft

Rohköstler essen hauptsächlich unerhitzte pflanzliche Lebensmittel – Obst, Gemüse, Nüsse, Samen, Sprossen und fermentierte Lebensmittel. Oft werden Lebensmittel nicht über 40-48°C erhitzt.

Höhere Aufnahme von hitzeempfindlichen Vitaminen (C, B9), mehr Ballaststoffe, weniger verarbeitete Lebensmittel und Zusatzstoffe. Viele Menschen berichten von mehr Energie und besserem Wohlbefinden.

B12-Mangel (nur in tierischen Produkten), Vitamin D-Mangel, unzureichende Proteinaufnahme und Kalorienmangel sind reale Risiken. Hülsenfrüchte sind roh ungenießbar und teilweise giftig.

Eine vollständige Rohkosternährung ist für die meisten Menschen schwer durchzuhalten und nicht für alle gesundheitlich ideal. Eine Erhöhung des Rohkostenanteils in der normalen Ernährung ist für die meisten Menschen eine bessere Option.

Long-term raw food diets carry several well-documented nutritional risks. Calorie insufficiency is common — raw plant foods are so high in fibre and water that it can be physically difficult to consume enough calories to maintain body weight, particularly for active individuals. The Giessen Raw Food Study found that approximately 30 percent of women on long-term raw food diets had partial or complete amenorrhoea (loss of menstruation), indicating energy deficiency sufficient to disrupt reproductive function.

Vitamin B12 deficiency is virtually guaranteed without supplementation, as B12 is found almost exclusively in animal-derived foods and is not reliably present in any raw plant food (claims about B12 in algae or fermented foods are largely unfounded — these contain B12 analogues that may actually interfere with true B12 metabolism). Bone health is a concern: the same German study found significantly lower bone mineral density in raw food dieters. Low calorie and protein intake, reduced calcium bioavailability from raw oxalate-rich greens, and low vitamin D (from reduced dietary sources) all contribute. Iron and zinc absorption is impaired by the phytates and oxalates present in uncooked plant foods. Omega-3 fatty acid intake (particularly EPA and DHA) is typically very low.

Cooking is one of humanity's most important food safety technologies. Heat kills pathogenic bacteria (Salmonella, E. coli, Listeria, Campylobacter), parasites, and viruses that can contaminate raw foods. While raw fruits and vegetables carry relatively lower risk than raw animal products, they are not risk-free — sprouts (alfalfa, mung bean) are frequently associated with foodborne illness outbreaks because their warm, humid growing conditions also favour bacterial growth. Raw unpasteurised dairy and raw eggs carry well-established pathogen risks.

Raw food practitioners who consume raw animal products (raw fish, raw meat, raw eggs, raw milk) face substantially elevated food safety risks. While sashimi-grade fish and steak tartare prepared in professional settings with strict sourcing and hygiene standards carry manageable risk for healthy adults, home preparation of raw animal products without professional training increases danger significantly. Pregnant women, young children, elderly individuals, and anyone with compromised immunity should not consume raw animal products. Even on a raw vegan diet, thorough washing of produce is essential, sprouts should be consumed with caution, and anyone experiencing gastrointestinal symptoms should consider whether food safety practices are adequate.

The scientific evidence supports neither an exclusively raw nor an exclusively cooked diet. The optimal approach, supported by nutritional research, is a balanced combination that leverages the strengths of both. Eat raw foods where rawness preserves nutrients: salads, fresh fruits, raw nuts and seeds, and vegetables that are palatable and safe uncooked (carrots, peppers, cucumber, cabbage). Cook foods where cooking increases nutrient availability or safety: tomatoes (for lycopene), carrots (for beta-carotene), grains (for digestible starch), legumes (for protein and to destroy anti-nutrients and lectins), and any animal products.

A practical ratio might be 50 to 60 percent of plant food intake consumed raw (salads, fresh fruits, smoothies, raw nuts) and 40 to 50 percent cooked (roasted vegetables, steamed greens, cooked grains, soups). This approach captures the benefits of high raw food intake — abundant fibre, phytonutrients, and minimal processing — while avoiding the deficiency risks of a fully raw diet. Choose gentle cooking methods (steaming, light sauteing, roasting) over aggressive methods (deep frying, prolonged boiling) to minimise nutrient loss. And regardless of how much raw food you eat, supplement vitamin B12 if you eat little or no animal food.

If you found this guide useful, the following deeper reads expand on neighbouring topics and will help you put the principles into practice across the rest of your kitchen routine: Carnivore Diet: What the Science Actually Says, Risks, and Who It Might Help, Treating irritable bowel syndrome with a food elimination diet followed by food challenge and probiotics, The Zone Diet: Complete Guide to the 40/30/30 Ratio, Block Method, and What the Science Shows, The Risk of Rapid Weight Loss: Protecting Your Gallbladder and Heart. Each of these has been written to stand alone, so dip in wherever the topic feels most relevant to what you are working on this week — together they form a connected library of practical, evidence-based home-cooking knowledge that grows more useful the more of it you read.

The guidance in this article draws on peer-reviewed nutrition and food-science literature as well as guidance from major public-health bodies. Key reference sources we have consulted while writing and updating this piece include:

• Harvard T.H. Chan School of Public Health, *The Nutrition Source*, 2024. • U.S. National Institutes of Health (NIH), Office of Dietary Supplements, fact sheets, 2024. • World Health Organization (WHO), Healthy Diet fact sheet, 2024. • Cochrane Database of Systematic Reviews — relevant systematic reviews, 2020–2024. • British Dietetic Association (BDA) Food Fact Sheets, 2024.

These references are provided so that motivated readers can verify claims and explore the underlying evidence directly. Where a specific trial, meta-analysis, or named author is referenced in the body of the article, that citation takes precedence over the general sources listed here. The article is reviewed periodically against newly published evidence and updated when meaningful new findings emerge.