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Friend looks terrible. She's very thin, yellow skin, bloodshot eyes…

- - - - A big one that she is most likely missing is vitamin B12. It is only naturally found in animal products, such as poultry, fish and dairy. A lack of B12 can cause fatigue, loss of appetite/weight loss and other symptoms.
        
        Calcium, which can often be found in dairy products, maintain bone health. A lack of this can contribute to her sallow skin.
        
        Omega-3, usually found in fish and eggs, is important for heart and brain health as well as reduced inflammation.
- - - - The RDA (recommended daily allowance) is the estimated amount of nutrients that should be consumed per day to maintain good health. It is impossible to list every requirement here, as the daily recommendations depend on sex, weight and age.
    - - Lipids are used similarly to carbohydrates, in which the body uses lipids as an energy source as well as for insulation.
        
        Protein is an important building block for the body. The body uses it for building bones, muscle, cartilage and skin as well as using it to make hormones and other bodily chemicals.
        
        Nucleic acid is involved exclusively with genetic information. It is involved with DNA and RNA and participates in protein synthesis.
        
        Magnesium is used in maintaining nerve and muscle function and supports the immune system.
        
        Calcium helps maintain healthy teeth and bones.
        
        Vitamin C helps grow and develop all bodily tissues. Involved in many functions.
        
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  - - - Nutrients such as omega-3 are important in the cardiovascular system because they reduce the chance of developing heart disease and/or a chance of having a stroke.
        
        For the endocrine system, nutritional balance is important to help maintain hormonal levels. With each organ producing some kind of hormone, proper nutrition is key to keeping them running efficiently.
        
        Nutrients such as omega-3, vitamin b1/3 are all important in maintaining cognitive function, vision developement, and other functions in the nervous system.
        
        Keeping proper nutrient levels in the body is especially important for the urinary system. The reason for this is because the urinary system filters out useful nutrients and converts them to energy and removes the excess waste.