tydurden,

You may consider including lots of MCT's, Medium Chain Triglycerides to your diet. MCT's are brain food when the body is in a famine mode ? Coconut oil is the most common MCT.

You can get MCTs from whole foods: here's a list of MCTs in foods, as a percentage of total fats (source):

Coconut oil: 15%
Palm kernel oil: 7.9%
Cheese (if you tolerate dairy): 7.3%
Butter: 6.8%
Milk: 6.9%
Yogurt: 6.6%
http://paleoleap.com/mct-oil-need-know/

So, try to limit the reduction of these foods.

Why do you need to lose weight so fast ?