Fiber helps absorb fat and cholesterol as it travels down your digestive tract, reducing the amount of fat the body absorbs, says Linda Illingworth, RD, the director of nutrition for Cal-a-Vie Health Spa in Vista, California. A simple switcheroo, like the one that's done at Cal-a-Vie Health Spa, is a practically effortless way to drop stubborn pounds. Most people consume the majority of their calories at night. Big mistake, because your metabolic rate decreases when you sleep, and calories that aren't torched get stored as fat.