poor niah. This can definitely all be confusing at first.
A huge mistake many of us (myself included) make when we start our paleo/primal journey is inadvertently restricting calories to a huge degree. This is an unintentional byproduct of quitting bread/sugar carbs. Many on the sad (standard american diet) will find that the majority of their daily calorie intake was made of carbohydrates - some obvious like rice and bread, some less so like soda and sweetened sauces/dressings.
If you just cut out all of that and trim your diet back to "all the same stuff i was eating, but without the bread" you end up taking in far less calories and not doing anything to offset all the carbs you dumped from your daily dose of bread, hfcs (high fructose corn syrup), rice, apple, or whatever it was that was with each meal.
The answer to this is eat more of the primal things you like. More meat, more fat, more veggies, fruit every now and then is good too. Don't stress too much about the numbers right now -
just get used to eating to satisfaction with wholesome foods.
we are here to help!
Here is a very simple sample meal plan:
B: 3 eggs, 4 strips bacon. Optional full fat cottage cheese, greek yogurt, or sour cream.
L:
big ass salad! Bunches of romaine and spinach and arugula. Cucumbers, mushrooms, carrots, tomatoes. Canned tuna or grilled chicken. Hard cheese like romano or maybe some feta.
D: Large chicken breast
cooked like this. fatty steak
cooked like this (sub butter for canola oil). Vegetables roasted in butter in the oven with garlic.
Snacks: Handful almonds or macadamia nuts. Cubed cheddar.