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You feel week,sick because you have low vit D
Vitamin D is impotent for are body it promotes calcium absorption.
Very few foods in nature contain vitamin D.
The flesh of fatty fish (such as salmon, tuna, and mackerel) and fish liver
oils are among the best sources. Small amounts of vitamin D are found in beef liver, cheese, and egg yolks,Fortified milkfortified cereal provides a more balanced meal than a Vitamin D supplement.Ricotta cheese stands out among cheeses for its relatively high Vitamin D content.
Exposing yourself to sunlight (10 to 15 min)is the most important source of vitamin D because sunlight is far more likely to provide you with your vitamin D requirement than food.