All about fruitarianism with a long-term fruitarian, Lena

In recommending intakes for vitamin D, it must be recognized that in most locations in the world in a broad band around the equator (latitudes 42°N - 42°S), the most physiologically relevant and efficient way of acquiring vitamin D is to synthesize it endogenously in the skin from 7-dehydrocholesterol by sun (UV) light exposure.

In most situations, ~ 30 minutes of skin exposure of the arms and face to sunlight can provide all the daily vitamin D needs of the body.

Skin synthesis of vitamin D is negatively influenced by factors which may reduce the ability of the skin to provide the total needs of the individual:

  • latitude and season - both influence the amount of UV light reaching the skin;
  • ageing process - thinning of the skin reduces the efficiency of this synthetic process;
  • skin pigmentation - the presence of darker pigments in the skin interferes with the synthetic process because UV light cannot reach the appropriate layer of the skin;
  • clothing - virtually complete covering of the skin for medical, social, cultural, or religious reasons leaves insufficient skin exposed to sunlight;
  • sunscreen use - widespread and liberal use of sunscreen, though reducing skin damage by the sun deleteriously affects synthesis of vitamin D.

Because not all of these problems can be solved in all geographic locations, particularly during winter at latitudes higher than 42° where synthesis is virtually zero, it is recommended that individuals not synthesizing vitamin D should correct their vitamin D status by consuming the amounts of vitamin D. 

Recommended nutrient intakes (RNIs) for vitamin D, by group, in milligrams (1/1000 g):

Infants, children, adolescents, and adults 19–50 years, pregnant and lactating women - mg a day RNI;

Adults 51–65 years - 10 mg a day RNI

Adults 65+ years - 15 mg a day RNI

Leo Tolstoy

A man can live and be healthy without killing animals for food; therefore, if he eats meat, he participates in taking animal life merely for the sake of his appetite. And to act so is immoral. 

Vitamin B3 Niacin

Vitamin B3, Niacin, nicotinic acid, helps to convert food into energy and is essential for healthy skin, blood cells, brain, and nervous system. It is one of 8 B vitamins. It is water-soluble, which means it is not stored in the body. It has 2 other forms, niacinamide (nicotinamide) and inositol hexanicotinate, which have different effects. 

Niacin occurs naturally in food and can also be made by your body from the amino acid tryptophan, with the help of B6

It is rare for anyone in the developed world to have a Vitamin B3 deficiency; alcoholism is the main cause of it in the US.

Recommended daily amount: 14 - 16 mg.

Example sources: whole grains, mushrooms, peanuts and other legumes. 

Fruits (100 g) : 

  1. Peaches or Apricots, dried - Niacin: 4 mg 
  2. Avocados, raw or Dates, medjool  - Niacin: 2 mg 

Seeds (100 g):

  1. Rice bran, crude - Niacin: 34 mg 
  2. Sesame flour - Niacin: 13 mg 
  3. Sunflower seed kernels, dried - Niacin: 8 mg 

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