I dont think there is neccesarily a limit to carbs or sugar. Sugar feeds the candida so the more of it you eat, the more you will feed the candida.
Carbs are broken down by the body into glucose (sugar). The glucose is stored in muscles as glycogen, and when fuel is needed the body turns this back into glucose for energy. This is the reason athletes eat lots of carbs before strenuous activity. This is also the reason why this diet has a lot of moderately low GI foods.
Kamut is between 40 and 45 on the glycemic index. The GI is a measure of how rapidly carbohydrates are broken down into sugar and enter the bloodstream raising the blood sugar. This is a medium level GI food. The GI chart measures from 0-115.
Broccoli, cauliflower, etc. are about a 15 on the GI.
When i started the diet i was also tired, especially in the morning. Also, some of the users feel if taking nothing else molybdenum would be beneficial not only to help with die-off mentally, but to protect the body from the ill effects of die-off on your internal organs.