All about fruitarianism with a long-term fruitarian, Lena

Nutrients

Nutrients are component in foods that an organism uses for maintenance and growth.

  • B12 Supplementation Effective Sublingually and Orally

    A dose of 500 µg of cobalamin given either sublingually or orally is effective in correcting cobalamin deficiency

  • Vitamin B12 Deficiency as a Worldwide Problem

    Pernicious anemia is a common cause of megaloblastic anemia throughout the world and especially in persons of European or African descent. Dietary deficiency of vitamin B12 due to vegetarianism is increasing and causes hyperhomocysteinemia.

    The breast-fed infant of a vitamin B12–deficient mother is at risk for severe developmental abnormalities, growth failure, and anemia. Elevated methylmalonic acid and/or total homocysteine are sensitive indicators of vitamin B12–deficient diets and correlate with clinical abnormalities.

    Dietary vitamin B12 deficiency is a severe problem in the Indian subcontinent, Mexico, Central and South America, and selected areas in Africa. Dietary vitamin B12 deficiency is not prevalent in Asia, except in vegetarians. Areas for research include intermittent vitamin B12 supplement dosing and better measurements of the bioavailability of B12 in fermented vegetarian foods and algae.

  • B12 May Be Synthesized by Small Intestine Microflora

    In man, physiological amounts of vitamin are absorbed by the intrinsic factor mediated mechanism exclusively in the ileum, the third portion of the small intestine. Human faeces contain appreciable quantities of vitamin B12 or vitamin B12-like material presumably produced by bacteria in the colon, but this is unavailable to the non-coprophagic individual. However, the human small intestine also often harbours a considerable microflora and this is even more extensive in apparently healthy southern Indian subjects. We now show that at least two groups of organisms in the small bowel, Pseudomonas and Klebsiella sp., may synthesise significant amounts of the vitamin.

  • Lean Meat is Not Pure Protein

    "Lean meat" is a misleading term. I noticed many times in conversations that people who think that they eat "proteins" tend to think about this food group as an almost pure protein, a perfect set of essential amino acids. Especially if they consume so called "lean meats." 

    In beef (presented as "90% lean meat") - half of the calories are from fat (http://nutritiondata.self.com/facts/beef-products/6193/2). Even in the leanest bird meat approximately the fifth of the energy is from fat, ~18% in the leanest I could find (http://nutritiondata.self.com/facts/poultry-products/704/2).

    Digestibility-corrected amino acid score (PDCAAS) of protein in beef is only 0.92, chicken - 0.91(?), and egg whites and soy - 1 or 100% (not that it matters much). Note, that 62% of calories in a whole egg are from fat, and 40% in soybeans. 

  • Sugars Can Be Turned into Fat

    When we are eating excess amounts of carbohydrates (sugars), liver converts the carbon compounds from sugar into fatty acid, and then fat.

    If we continue to consume too much of sugars, complex or simple, and to accumulate fat, especially in the waist area, we can develop insulin resistance.

  • High-Fat Diets and Obecity

    High-fat diets and low physical activity levels may accentuate the susceptibility to obesity by the FTO variant. The fat mass and obesity-associated gene (FTO) has been shown to be associated with obesity and to influence appetite regulation.

  • Data

    • Concise knowledge summaries of research related to fruitarianism,
    • summaries and reports about results derived by scientific method,
    • short aggregated definitions and overviews,
    • citations related to fruitarianism,
    • expert opinions, 

    - from scientific internet publications, mass media and other seemingly credible online sources, with links.

    Sources: 

    • Primary sources, like governmental agencies documents and research results published in peer reviewed journals; 
    • Secondary sources, like scholarly articles and expert reviews;
    • Tertiary sources, like encyclopedias, dictionaries, and textbooks.

Fyodor Dostoyevsky

Man, do not pride yourself on superiority to animals.

Protein Digestibility-Corrected Amino Acid Score

The protein digestibility-corrected amino acid score (PDCAAS) has been adopted by FAO/WHO as the preferred method for the measurement of the protein value in human nutrition. 

PDCAAS = Amino Acid Score x Digestibility

The method is based on comparison of the concentration of the first limiting essential amino acid in the test protein with the concentration of that amino acid in a reference (scoring) pattern. This scoring pattern is derived from the essential amino acid requirements of the preschool-age child.

Although the principle of the PDCAAS method has been widely accepted, critical questions have been raised in the scientific community:

  1. the validity of the preschool-age child amino acid requirement values (more than 4 times greater than the EAA requirement for an adult),
  2. the validity of correction for fecal instead of ileal digestibility,
  3. the truncation of PDCAAS values to 100%.

The reference scoring pattern was based on studies performed more than 25 years ago on a limited number of 2-year-old children recovering from malnutrition.

According to the current official recommendations, a 2-year old child needs ~ 3x higher essential-to-non-essential amino acid ratio, and needs essential amino acids in different proportions than adult. Methionine/cysteine is the limiting essential amino acids for adults, and for children it is lysine or tryptophan.

The use of fecal digestibility overestimates the nutritional value of a protein because amino acid nitrogen entering the colon is lost for protein synthesis in the body and is, at least in part, excreted in urine as ammonia.

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