All about fruitarianism with a long-term fruitarian, Lena

Supplementation of vitamin D is effective in preventing overall mortality in a long-term. It is not significantly effective in a treatment duration shorter than 3 years. 

Vitamin D therapy significantly decreased all-cause mortality with a duration of follow-up longer than 3 years. No benefit was seen in a shorter follow-up periods. 

The following subgroups of long-term follow-up had significantly fewer deaths:

  • female only,
  • participants with a mean age younger than 80,
  • daily dose of 800 IU or less,
  • participants with vitamin D insufficiency and cholecalciferol therapy.

The combination of vitamin D and calcium significantly reduced mortality and vitamin D alone also had a trend to decrease mortality in a longer time follow up.

Gottfried Wilhelm Leibniz

We live in the best of all possible worlds.

Vitamin A

Retinoids retinol, retinal, and retinoic acid - 3 active forms of vitamin A - "preformed" vitamin A.

Beta carotene can easily be converted to vitamin A by the human body. 

Large amounts of supplemental vitamin A (but not beta carotene) can be harmful to bones.

Vitamin A keeps tissues and skin healthy, plays an important role in bone growth. Diets rich in the carotenoids alpha carotene and lycopene seem to lower lung cancer risk. Carotenoids act as antioxidants. Foods rich in the carotenoids lutein and zeaxanthin may protect against cataracts. Essential for vision lycopene may lower prostate cancer risk.

Recommended daily amount: 700 mcg - 900 mcg or 3 mg - 6 mg beta-carotene (~ 1 cup of raw cantaloupe or sweet red peppers, or 2 mangoes, or 1/5 of one baked sweet potato). 

Because the body converts all dietary sources of vitamin A into retinol, 1 mcg of physiologically available retinol is equivalent to the following amounts from dietary sources: 1 mcg of retinol, 12 mcg of beta-carotene, and 24 mcg of alpha-carotene or beta-cryptoxanthin. From dietary supplements, the body converts 2 mcg of beta-carotene to 1 mcg of retinol.

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