You simply are not fueling your body enough with meat and fat for your level of activity. You were fueling with sugar in the milk and sugar and now you have to replace that energy with fat and meat. Yes no fruit but why stop the cheese? It looks like you are eating for comfort with the calliflower and broc and mushrooms and nuts...nuts are too high in omega 6 fatty acids...except for the macadamias. They have good saturated fat. So do avocados. Cut out the protein/fat snacks. Look at the label and see how much gluten products and sugar products are in those things. Any word that ends in "ose" is a sugar/fructose.

Fuel your body with real animal protein and fat, coconut oil, butter/ghee, palm oil, avos, macs, olive oil, eggs cooked in coconut oil or butter.

Kangaroo meat has only 2% fat but has good quality protein.

I suspect you are overloading on protein and not enough fat. Many of the paleo people here eat 75% fat, 20% protein and 5% carbs or less.

Try this...eat only 6 eggs deep fried in coconut oil plus 1/8 pound of bacon and coffee with all the heavy cream you want for breakfast. Macs and avocados for lunch. Dinner 20 ounces of steak pan fried in a liberal amount of coconut oil with all the fat around the edge. A large salad with only olive oil and vinegar. You do this for a week, and I bet your fog and loss of mental clarity will disappear.

Good luck to you. Fuel your body with meat and fat.

You are not yet Keto adapted. Its that simple.

Your body burns fat and uses ketones for energy when glucose is not available.

If youre eating S.A.D. and constantly putting food in, you blood glucose stays high from intake.If you drop all that incoming sugar, you body will learn to hold it for a while, but is really an efficient machine.

Your body will relearn to use body fat for energy when you arent feeding it glucose, but it can takes time, faster if you go into ketosis often, or intermittently fast daily.

Once you have made the transition, you will find energy all day, and the ability to switch back and forth between low carb and moderate carb with no flux in energy.

I hate saying it, but this is one of those "give it time" situations. your mitochondria need to reprogram.

If I understand you correctly:

• You have been eating paleo for over a year now and loving it.

• You lost weight and have had great crossfit results etc.

• This month you are doing the whole 30 and you are struggling and generally feeling bad.

So what you were doing before was working well and what you are doing now is not working.

My first suggestion would be to try going back to what you were doing before. Try and make any changes, such as those suggested in other answers, from that position. Then you have more of an idea as which changes are working for you.