Fats – Types, Functions & Health
Fats are essential macronutrients that provide the body with energy, support cell membrane structure, and enable the absorption of fat-soluble vitamins.
Things worth knowing about "Fats"
Fats are essential macronutrients that provide the body with energy, support cell membrane structure, and enable the absorption of fat-soluble vitamins.
What Are Fats?
Fats (also known as lipids) are one of the three main macronutrients, alongside carbohydrates and proteins. Chemically, fats consist primarily of triglycerides – molecules made up of glycerol and three fatty acids. They are insoluble in water and provide 9 kilocalories per gram, making them the most energy-dense macronutrient – more than twice the energy of carbohydrates or proteins.
Fats are found in both animal and plant-based foods and perform numerous vital functions in the human body. An adequate and balanced fat intake is therefore essential for good health.
Types of Fats
Saturated Fatty Acids
Saturated fatty acids are generally solid at room temperature and are found primarily in animal products such as butter, meat, cheese, and processed meats, as well as in coconut oil and palm fat. High consumption of saturated fats is associated with elevated LDL cholesterol levels and an increased risk of cardiovascular disease.
Monounsaturated Fatty Acids
Monounsaturated fatty acids, such as oleic acid found in olive oil, rapeseed oil, and avocados, are considered heart-healthy. They can help lower LDL cholesterol levels and are a cornerstone of the Mediterranean diet.
Polyunsaturated Fatty Acids
Polyunsaturated fatty acids include the nutritionally important omega-3 and omega-6 fatty acids. These are considered essential because the body cannot produce them on its own and must obtain them through diet. Omega-3 fatty acids are found in fatty fish (e.g., salmon, mackerel), flaxseeds, and walnuts. Omega-6 fatty acids are abundant in plant oils such as sunflower and corn oil.
Trans Fatty Acids
Trans fatty acids are formed during the industrial hardening of vegetable fats (hydrogenation) and occur naturally in small amounts in animal products. Industrial trans fats are considered particularly harmful as they raise LDL cholesterol while simultaneously lowering HDL cholesterol. The World Health Organization (WHO) recommends eliminating industrial trans fats from the diet entirely.
Functions of Fats in the Body
- Energy supply: Fats are the body's most concentrated energy source and serve as energy reserves stored in adipose tissue.
- Cell membrane structure: Phospholipids, a special class of lipids, are fundamental components of every cell membrane.
- Absorption of fat-soluble vitamins: Vitamins A, D, E, and K can only be absorbed from the gut in the presence of dietary fat.
- Hormone synthesis: Cholesterol, a lipid, is the precursor for important steroid hormones including estrogen, testosterone, and cortisol.
- Thermal insulation and organ protection: Subcutaneous fat insulates against cold and cushions internal organs.
- Nervous system support: Myelin, the protective sheath around nerve fibers, is largely composed of fat.
Recommended Fat Intake
The German Nutrition Society (DGE) recommends that fat should account for 30 to 35% of total daily energy intake. Saturated fats should be limited to less than 10% of total energy, while unsaturated fats are preferred. The WHO supports similar guidelines on an international level.
A balanced fat intake does not mean consuming as little fat as possible – it means paying attention to the quality of fats: high-quality plant-based oils, fatty fish, and nuts should be favored, while heavily processed foods containing trans fats should be avoided.
Fats and Health
An imbalance in fat intake can cause various health problems:
- Too much fat: Excessive fat consumption, particularly saturated and trans fats, can contribute to overweight, dyslipidemia (abnormal blood fat levels), atherosclerosis, heart disease, and type 2 diabetes.
- Too little fat: Extreme fat restriction can lead to deficiencies in fat-soluble vitamins, hormonal imbalances, skin problems, and impairment of the nervous system.
The Mediterranean diet, rich in monounsaturated fats from olive oil and omega-3 fatty acids from fish, is considered especially beneficial for cardiovascular health and is supported by extensive scientific evidence.
Overview of Fat-Containing Foods
- High-quality fat sources: Olive oil, rapeseed oil, flaxseed oil, avocado, salmon, mackerel, walnuts, flaxseeds, chia seeds
- Moderate sources: Eggs, dairy products, lean meat
- Sources to limit: Butter, cream, fatty meats, processed meats, coconut fat
- Sources to avoid: Industrially hydrogenated fats, fast food, ready-made products containing trans fats
References
- German Nutrition Society (DGE): Reference values for nutrient intake – Fats. www.dge.de (2024)
- World Health Organization (WHO): Healthy diet – Fact Sheet. www.who.int (2020)
- Hu FB et al.: Dietary fat intake and the risk of coronary heart disease in women. New England Journal of Medicine, 337(21): 1491–1499 (1997)
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