Vitamin B12 is necessary for many functions. People who eat vegetarian or vegan diets or those with absorption issues are at risk of deficiency.

National Heart, Lung and Blood Institute  

JAMA Otolaryngology-Head and Neck Surgery  

Journal of the Canadian Dental Association  

The Journal of the Association of Schools and Colleges of Optometry  

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Which nutrients your body will get and how much depends on your diet. Nutrients are chemical substances that help your body maintain tissues, make energy, regulate different processes, etc. Nutrition is the process of taking nutrients from various foods. There are six classes of nutrients: lipids, carbohydrates, proteins, water, minerals, and vitamins.

The third three classes are known as macronutrients because our bodies need them in large quantities. Lipids, carbohydrates, and proteins are unique because they are the only elements that provide the body with energy. Energy is measured in calories.

Water is also a nutrient that some scientists categorize as a macronutrient because our bodies need it in large quantities. Water is quickly lost through sweat and evaporation, so you need to fill up by drinking liquids and eating fruits, vegetables and other foods that contain water.

Consuming a healthy diet with vegetables, fruits, protein, and dairy ensures the body has enough nutrients to use.

Food

The foods you eat have a huge influence on your ability to enjoy life. One of the main effects of food is the feeling you get from eating a delicious meal. There are many different chemical substances in food, including macronutrients, micronutrients, water and dietary fiber. Macronutrients, for example, protein, are present in large amounts. Micronutrients are present in smaller quantities, for example, vitamins.

Food can also contain flavors, colors, active substances such as steroids, caffeine and salicylates, additives and natural toxins. Different characteristics of food depend on the presence of chemicals in them.
The chemical nature of food can be changed by preservation, storage and, of course, cooking. Moreover, food chemicals can interact with each other. For example, the way in which our bodies absorb carbohydrates depends on dietary fiber, even though our bodies don't absorb the fiber itself.

Which foods you eat have long-term effects on your health. Healthy foods help prevent some chronic diseases and decrease recovery periods from the disease.

15 Symptoms of B12 Deficiency

9. Vision Changes

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