Introduction: Protein – The Foundation of Life and Nutrition
Protein is one of the three primary macronutrients, along with carbohydrates and fats, and plays a fundamental role in the functioning of the human body. It serves as a building block for cells and tissues, participates in the production of enzymes, hormones, and antibodies, and performs transport and regulatory functions. Optimal protein intake is critical for maintaining health, growth, and recovery; however, specific needs can vary significantly depending on a multitude of factors. Given the diversity of modern dietary approaches, understanding how different diets affect the intake of protein and its associated nutrients is becoming particularly relevant.
Protein in Plant-Based Diets: Challenges and Benefits
In recent years, plant-based diets (PBDs) have gained popularity for ethical and environmental reasons, as well as for their potential health benefits [3]. These diets, which exclude or significantly limit animal products, demonstrate effectiveness in weight management. Research shows that plant-based diets can lead to significant weight loss (on average about 5 kg), as well as a reduction in total calorie intake, blood pressure, fasting plasma glucose, and total cholesterol [3].
The main sources of protein in plant-based diets are legumes, grains, nuts, seeds, and certain vegetables. Although plant-based protein sources can be complete, it is important to ensure sufficient variety to obtain all essential amino acids. However, when switching to a strictly plant-based diet, such as veganism, there is a risk of deficiency in certain important micronutrients. For example, vitamin B12 deficiency is common among vegans and vegetarians due to insufficient dietary intake, which can lead to serious medical consequences if not timely diagnosed and corrected [1]. This underscores the need for careful meal planning and, potentially, supplementation when following plant-based diets.
Interestingly, some plant-based foods are rich in polyamines, such as spermidine, which is associated with a reduction in cardiovascular and all-cause mortality. These compounds are found in abundance in plant-based and fermented foods [5].
Low-Carbohydrate Diets and Protein: Balancing Macronutrients
Low-carb diets have been used for weight control since 1863 and have regained popularity in recent decades [2]. These diets can vary significantly in carbohydrate content but are generally defined as diets in which less than 40-45% of total daily energy intake comes from carbohydrates [2]. For comparison, the Institute of Medicine has established an acceptable macronutrient distribution range for carbohydrates at 45-65% of total daily energy [2].
When carbohydrates are significantly reduced in the diet, the proportion of fats and proteins typically increases to ensure sufficient energy value. Low-carbohydrate diets are used not only for weight loss but also for improving metabolic health and treating chronic diseases [2]. An example of such a diet is the Modified Atkins Diet (MAD), which is a high-fat, low-carbohydrate diet used, in particular, for the treatment of severe epilepsy [4].
Studies show that when following the Modified Atkins Diet, adults exhibit higher intake of fat-soluble vitamins (A, D, E), but at the same time, there is a decrease in the intake of certain water-soluble vitamins (e.g., vitamin C), electrolytes (potassium), and minerals compared to a standard diet [4]. This indicates the need for careful monitoring of micronutrient status when following low-carbohydrate diets to prevent potential deficiencies.
The Importance of Micronutrients When Changing Diets
Any significant changes in diet, especially those involving the exclusion of entire food groups, require increased attention to micronutrient intake. As noted, plant-based diets can lead to vitamin B12 deficiency [1], and low-carbohydrate diets can affect the balance of water-soluble vitamins, electrolytes, and minerals [4].
To maintain optimal health, it is important not only to ensure sufficient protein intake but also to ensure that the body receives all necessary vitamins and minerals. In some cases, additional intake of vitamin-mineral complexes or fortified foods may be required. Regular health monitoring and consultations with specialists will help to timely identify and correct possible deficiencies.
Individual Approach to Protein Intake
There is no single universal standard for protein intake that is suitable for every person. Individual protein needs depend on a multitude of factors, including age, gender, physical activity level, general health status, the presence of chronic diseases, and goals such as muscle gain, weight loss, or recovery from injury. For example, athletes or people leading an active lifestyle may require more protein for muscle recovery and energy maintenance.
To receive personalized recommendations on protein intake and to create a balanced diet that meets your individual needs and health status, it is crucial to consult a qualified physician or a registered dietitian. A specialist will help assess your current diet, lifestyle, and goals, and develop an optimal nutrition plan that will provide the body with all necessary macro- and micronutrients.
Sources
- 1. Expert opinions on the diagnosis and treatment of vitamin B12 deficiency in adults. https://pubmed.ncbi.nlm.nih.gov/42641763/
- 2. Low-carbohydrate diet. https://pubmed.ncbi.nlm.nih.gov/30725769/
- 3. Review of plant-based diets for the treatment of obesity. https://pubmed.ncbi.nlm.nih.gov/38729570/
- 4. Micronutrient intake in adults with drug-resistant epilepsy receiving the modified Atkins diet requires monitoring. https://pubmed.ncbi.nlm.nih.gov/42180576/
- 5. Spermidine and spermine in elderly patients with coronary heart disease: a cross-sectional study of dietary intake and concentrations in plasma and skeletal muscle. https://pubmed.ncbi.nlm.nih.gov/42000692/
The information provided in this article is for reference purposes only and is not intended for self-diagnosis or self-treatment. Always consult a qualified medical professional for personalized nutrition and treatment recommendations.