Proteins
Let's take a closer look at proteins.
Delivering the adequate quantity of proteins to the body is necessary to build new and maintain current structures. Various nutritional studies present the recommended amounts of specific nutrients that people should consume daily to run a long and healthy life. Dietary Reference Intakes: The Essential Guide to Nutrient Requirements (2006) issued by Institute of Medicine of the National Academies, 2006, USA recommend a dose (RDA) of protein of 0.8g/kg body weight per day to prevent chronic illnesses among healthy adults with minimal physical activity.
In terms of hair, insufficient level of ingested proteins can cause hair to become finer, brittle, alopecia may occur from telogen effluvium, or lightening of hair.
Other symptoms in the body include dry skin, muscles atrophy, hypothermia, apathy, or kwashiorkor disease.
Overconsumption of proteins in the long term may also have a negative impact on health if consumed amounts far exceed the recommended ones for healthy individuals at the specific lifetime and gender.
In different studies the most common listed disorders are those related to bone and calcium homeostasis, renal and liver function, increased risk of cancer or precipitated progression of coronary artery disease. In case of occurrence, it will affect hair as well.
To meet the daily protein intake goal, the diet should include a variety of protein foods such as lean meats, poultry, seafood, legumes, nuts, eggs, soy.