What are macronutrients?

Macronutrients: The Cornerstones of Nutrition

The human energy requirement results from a complex interplay of various physiological factors. The amount of energy needed to maintain body temperature and the functionality of vital organ systems is primarily defined by the basal metabolic rate. This represents the minimum amount of energy the human body requires at rest to sustain essential functions such as respiration, circulation, and cellular metabolism.

The basal metabolic rate is supplemented by the thermic effect of food, known as diet-induced thermogenesis, which refers to the energy required for the digestion, absorption, and metabolism of food. In addition, physical activity plays a key role, as it significantly increases energy requirements depending on the duration, intensity, and type of activity.

The Individual Macronutrients

The quantification of this energy requirement is measured in kilocalories (kcal) and varies significantly depending on individual parameters such as age, sex, body composition, and health status. It is essential to meet this individually varying energy requirement through adequate nutrient intake to maintain homeostasis, i.e., the balance of bodily processes, and thus overall health. The specific energy provision of each macronutrient, as well as their metabolic efficiency and physiological functions, form a central foundation for nutritional science and dietary practice.

The Diversity of Carbohydrates

Carbohydrates are considered the main energy source for humans and constitute the largest portion of daily food intake. They have various functions, including the synthesis of hormones and enzymes. They provide 4 kcal per gram of energy and are the sole energy source for red blood cells (erythrocytes). The amount and quality influence satiety and various metabolic parameters. Long-term carbohydrate deficiency can lead to growth disorders, neurological damage, anemia, or motility disorders of the gastrointestinal tract. Carbohydrates are generally classified into three groups:

• Monosaccharides,
• Disaccharides, or
• Polysaccharides.

Monosaccharides consist of a single sugar unit. The most important are glucose and fructose. These cause a rapid blood sugar rise and short-term satiety. Disaccharides consist of either two identical or two different sugar units. The most well-known are table sugar (sucrose), maltose, and lactose. Polysaccharides consist of multiple sugar units, the most significant being starch and certain fibers such as cellulose. Polysaccharides provide a slow blood sugar increase and longer satiety.

The recommended daily intake of carbohydrates is at least 50% of total food consumption, particularly found in grains, grain products, and potatoes.

Proteins: Building Blocks of Life

Proteins are essential building blocks of the body and serve many key functions. They provide structural components for cells, tissues, enzymes, and hormones. Proteins modulate the immune system and act as transport substances for various nutrients. Like carbohydrates, they provide 4 kcal per gram of energy. Proteins also enable the body to synthesize its own proteins. Long-term deficiency can lead to growth disorders, neurological damage, or organ dysfunction.

Dietary proteins consist of multiple segments called amino acids. Some of these are essential, meaning the body cannot produce them and they must be obtained from food. Non-essential amino acids are used to build the body's own proteins. Not only is daily protein intake important, but also quality and bioavailability.

The recommended daily intake is 0.8 g of protein per kg of body weight for adolescents and adults. Proteins should make up at least 15% of total daily calories. High-quality animal protein sources include milk and dairy products, meat, fish, and eggs. Important plant sources include legumes, whole grain cereals, and potatoes.

The ABCs of Fats:

Fats are primarily known as carriers of flavor and aroma. Dietary fats have the following properties:

• Energy storage: ensuring supply of essential fatty acids, providing the most energy at 9 kcal per gram compared to carbohydrates and proteins.
• Carrier for fat-soluble vitamins: allowing the body to absorb these vitamins. Persistent deficiencies can result in growth disorders in children, impaired membrane formation, nervous system problems, and underdevelopment of the visual system and brain.

Dietary fat mainly consists of triglycerides, where a glycerol molecule binds three fatty acids. There are three types of fatty acids, differing in chain length and saturation. Fatty acids can be saturated, monounsaturated, or polyunsaturated. Saturated fatty acids contain single bonds between carbon atoms, are mainly obtained from food, but can also be synthesized from glucose in the body. They are primarily found in meat and processed meat products and can raise cholesterol levels.

Polyunsaturated fatty acids have health benefits: they reduce the risk of cardiovascular disease. Important examples include linoleic acid (found in sunflower, corn, and soybean oils) and alpha-linolenic acid (found in rapeseed, walnut, and flaxseed oils).

Promoting Health with HLH BioPharma Products

Regardless of the organ system, the three macronutrients perform vital functions. Carbohydrates, proteins, and fats together form the foundation of all metabolic processes in the body. They are the main components of nutrition and provide the energy needed daily.

Additionally, probiotics can play a crucial role in supporting a healthy gut environment, which is essential for the efficient utilization of macronutrients and strengthening the immune system.

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