Pike, you're probably having the same problem I had when I first went low carb, and it's a common mistake a LOT of people seem to make. You're probably not eating enough fat!

Add more butter and oils to whatever you're eating. Have cheese as a snack if you're feeling a bit weak. And eggs, eggs are like a super food!

If your diet is low carb AND low fat, then you're actually going to me in a malnourished starvation state. Your body doesn't need that much protein. You can actually starve yourself and have some serious medical problems if you eat too much lean meats without fats and carbs to balance it out.

Try eating fattier meats instead of the lean cuts, or add in fat by way of butter and oils.

Eat more nuts too!

I know some people who struggle with adding more fat into their diet actually start off the day by having coffee and throwing in either heavy whipping cream, a slab of butter, or a shot of coconut oil. It's enough fat to keep you going for most of the day and get rid of those weak feelings.