Ama is an Ayurvedic concept. In the FAQ are links to pages that explain about Dosha, and most of those pages also explain about AMA (undigested toxins) and Agni (digestive fire). Ginger raises digestive fire. There's a post in the FAQ that says something like gas, bloating, using pungent therapy... that will explain a lot of it, as will the increasing digestive power post. Also be sure to read the tongue diagnosis post. :)

Candida do us a big favor and digest foods that didn't quite get digested by stomach acids, bile and enzymes. When we give them a LOT of undigested foods, they go crazy and multiply and we start getting sick.