BERRIES – VITAMIN A
Vitamin A is supplied by various other berries. For example 100 g (about 4 oz) of fresh bilberries (blueberries) contain as much as 1.6 mg of pure vitamin A, and 100 g of blackberries, 0.8 mg. It is clear, then, that during the berry season you need not be solely dependent upon carrot juice and watercress as sources of this vitamin. Various berries will help to meet your daily requirement. This fact should be remembered by all those who suffer from the consequences of vitamin A deficiency, usually showing up in skin diseases, pathological changes in the hair, teeth and nails, softening of the cornea, obesity from glandular dysfunction, night-blindness (nyctalopia) and other conditions.
Although much has been done, said and written about vitamins, the last word on the subject has yet to be spoken. We are today catching a glimpse of the intricate interplay between vitamins, enzymes and hormones. Vitamin B12 is an indispensable component of the yellow respiratory enzyme; vitamin A, the opponent of the thyroid hormones and so on. Hyperthyroidism can thus be checked by eating plenty of food containing vitamin A, such as the berries mentioned above.
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