Because the odor is very strong! The Materia Medica - Vegetables, "garlic": "five meat that is five Sin, for its pungent odor faint God to cut sex also. Alchemist to small garlic, garlic, leeks, rue, caraway for the five meat; Taoist leeks, scallions, garlic, rue, caraway for the five meat; Buddhist to garlic, garlic, Xingqu, Ci onion, Unu onion for the five meat, Xingqu that is the ferula also." According to the Xing canal leaves like cranberries, roots like radish, raw and cooked taste like garlic; Ci onion that is onion; Unuuniuniuniuniuniuniuniuniuniuniuniuniuniuniuniuniuniuniuniunu, shape like leek. See Sanzang Faji (The Three Tibetan Laws).

The food produced by the immoderate gas of heaven and earth is heavy in flavor and poisonous, and eating it will injure the five viscera and six bowels; the monks are calm and peaceful, and the main lightness is not heavy in taste, so they abstain from eating it!

1 Garlic: sadness and restlessness fire, eat more than the mind is easy to diffuse not vibrant.

2 onion: hurt kidney water consumption gas, eat more emotional instability panic.

3 leek: injury to the dry grams of wood gas, liver fire is easy to anger and hurt feelings.

4Allium: injure the spleen trapped in the earth gas, the spleen and pancreas is not good often worry about melancholy.

5 Xing Drainage: injuring the lungs to shield the gold qi, lung labor often out of a pessimistic state of mind.

Please accept.