Proteins play a prominent role in diet and healthy living. For many dieters, protein is a key component not only for body maintenance but also for weight loss. Let’s see why protein is so important and how it can help you achieve your goals.

Why are proteins important?

Proteins are essential building blocks of the human body. They are composed of amino acids that are essential for the regeneration and growth of muscles, skin, hair, nails and many other tissues. They also play a role in the production of enzymes and hormones that regulate metabolism and many other physiological processes.

Proteins and weight loss

• Feeling full: proteins help maintain a feeling of fullness. High protein meals make us feel fuller for longer, reducing the risk of overeating.
• Metabolic enhancement: the digestion and metabolism of proteins requires more energy from the body than fats or carbohydrates. This thermal effect increases metabolism and helps burn more calories.
• Preserving muscle mass: during dieting, especially in calorie deficit, the body tends to lose muscle. Adequate protein intake helps preserve muscle mass, which is key to long-term weight loss and maintaining a healthy metabolism.

Proteins and blood sugar

Proteins also play an important role in regulating blood sugar levels. Here’s how:

• Slower rise in blood sugar levels: proteins are digested more slowly than carbohydrates, resulting in a more moderate and prolonged rise in blood sugar levels. This helps to prevent sudden spikes and drops in blood sugar levels, which is important for a stable energy supply and to control hunger.
• Insulin response: although proteins also stimulate insulin production, this response is generally more modest than for carbohydrates. Insulin is an anabolic hormone that helps glucose to enter cells and glycogen synthesis, but in excessive amounts can promote fat storage. A moderate insulin response is beneficial in controlling blood glucose levels and avoiding fat deposition.
• Gluconeogenesis: in the presence of protein intake, the liver can produce glucose from proteins (amino acids) in a process called gluconeogenesis. This can be particularly important in low carbohydrate diets when the body needs an alternative source of glucose.

Protein digestion and absorption

• Digestion in the stomach: digestion of proteins starts in the stomach, where the enzymes gastric acid and pepsin start to break down proteins into smaller polypeptides.
• Digestion in the small intestine: in the small intestine, pancreatic enzymes such as trypsin and chymotrypsin continue to break down polypeptides into even smaller peptides and amino acids.
• Absorption: the amino acids and small peptides produced during the digestive process are absorbed into the bloodstream through the walls of the small intestine. These amino acids are then transported to the liver, where they become part of various metabolic processes, or are transported to different parts of the body to participate in muscle building, the synthesis of enzymes and hormones, and other vital functions.
• Utilisation and storage: amino acids are used by the body for different purposes. They are used as building blocks in muscles and other tissues, while excess amino acids are converted to glucose or fat in the liver through a deamination process.

How much protein do we need?

Optimal protein intake depends on age, sex, body weight and physical activity. In general, the average adult needs 0.8-1 gram of protein per kilogram of body weight per day. For active athletes, bodybuilders and dieters, this can be higher, up to 1.2-2 grams per kilogram of body weight.

Protein-rich foods

• Animal proteins: meat (chicken, beef, turkey), fish, eggs, dairy products (milk, yoghurt, cheese).
• Proteins of plant origin: pulses (beans, lentils, chickpeas), nuts and seeds.

Quality of protein sources

The quality of protein sources is also important. Proteins from animal sources are complete, i.e. they contain all the essential amino acids the body needs. Proteins from plants are often deficient in one of the essential amino acids, but this problem can be easily remedied by a varied diet.

Summary

Protein is essential for a healthy diet and an effective diet. They help maintain a feeling of fullness, increase metabolism, preserve muscle mass and help maintain stable blood sugar levels. For optimal results, it is important that all meals contain adequate amounts and quality of protein to support weight loss goals and overall health.