If you do much research about the benefits and drawbacks of various types of grain, rye grain, whole, of course, is the number one recommended variety of grain. It has the most nutritional value per calorie of any other grain.

I tend to eat a lot of it...

And actually. Being "moderate" in your carbs is just silly. I'm not saying go hog wild either. But to be quite honest with you, carbs are the purest source of energy for your body. Just make sure you eat primarily complex carbs. Like fibers and such... Avoid starches like the plague. They're actually considered a complex carb, but they're actually worse for you than simple sugars. The problem with starches is that they don't get used by the body as readily and are almost always converted into fat stores... whether you need their energy or not.

As for simple sugars... Try to avoid sucrose, which is a disaccharide, and stick primarily to monosaccharides like fructose and glucose. Again, this is about the availability of the energy. Even though sucrose is considered to be a simple sugar, (aka it's commonly just called, "sugar", as in, table sugar), sucrose is in fact a combination of glucose and fructose. Therefore, we again run into the problem we have with starch. Our bodies can't make immediate use of it, except in this case, instead of becoming fat stores, it causes unnecessary harm to our internal organs as it's being broken down to glucose and fructose molecules to be used by our body. It gets used. And fast. But it's not very nice about it.

Eating right is actually very complicated and all those quack diets out there are just going to end up getting someone hurt. The best thing you can do is learn about the foods you eat yourself. Their various nutritional values. And balance your diet to get the nutrition you need and the calories (energy) you need. And NOT go over, on EITHER. That's very important to remember. It is, in fact, possible to take in too much NUTRITION, just as much as it is to take in too much calories. You should also watch what KIND of calories (energy) you consume. There's this thing called "empty calories"... they're not actually "empty" but they're things like starches... Instead of being broken down and immediately used by your body, they almost always end up as fat stores. This is something you do NOT want. At any age. It doesn't show as much when you're younger usually... But when you're older... It "catches up" with you.

From what I've heard of the paleo diet, it's actually not as quack as some I've heard... but still, I feel it rather under appreciates the value of complex and simple carbs. You need that energy. No matter what. How much you need depends on a number of factors, and is something you need to determine individually for yourself.

Talk to a nutritionist... a GOOD nutritionist. Find out your "energy" needs in a day. Balance your meals to achieve that and your nutrition needs. Just following a given diet fad of the week is worthless at best. And quite possibly even dangerous.