To each their own, but cutting carbs is a tried and true method for weight loss. Carbs contain sugars. Fruit contains fructose, bread has glucose, dairy products contain lactose, beer contains maltose, and so on. You can find yourself getting nowhere if you say to yourself "well I'll just cut sugar" but keep eating fruits and vegetables that are high in sugar content, such as bananas or tomatoes.
When I'm dieting hardcore, I stick to the green veggies. Those give me the carbs I need + fiber and nutrients without the sugar content. I usually eat oats in the morning to get my metabolism going and give me some energy , but you don't need to eat a bunch of carbs to have the energy to work out. In fact, the more tired you feel, the more fat you're burning, as feeling tired is a result of burning fat for fuel, as it's an inferior source of energy than food.
Personally I'd stick to only whole grains, oats, barley, brown rice - that sort of thing in limited quantities. I've had a lot of trial and error with dieting but sticking to fibrous carbs and lean meats with the right balance of healthy fats is never the wrong way to go.
