Ask Dr KK:Why curd is to be avoided in night?

It is not curd but one should not take any fermented food in the night as per Ayurveda practice. Fermented foods should not be combined with non-fermented foods in the night when the digestive fire is weak. They will end up in early petrifaction and resultant attack of acidity around midnight. Therefore after sunset, fermented items should be avoided, especially if they combined with non-fermented items. Eating them alone can still make sense from allopathic point of view. In Chennai, idli and dosa are not served in the night and in North India, curd is not offered in the night.