Craving sugar is a hallmark symptom of B1 deficiency. Source "Thiamine Deficiency Disease, Dysautonomia, and High Calorie Malnutrition" by Dr Derrick Lonsdale the world expert in b1 deficiency.

B1 is only absorbed in the ileum (small intestine).

The biofilm grown by the fungus (candida) is what covers the skin of the small intestine and it stops the ileum absorbing b1.