Fourth, serving sizes now more closely reflect the amount people actually eat. There's no doubt about it. And some of it is going to be particularly helpful to people trying to control their weight. By limiting fat alone, consumers will likely lower their calories, as well, and thus their weight, Brewer said. Calories can't be totally discounted.
Brewer points out they serve as the basis for determining a person's recommended daily fat intake.
Like the general population, dieters are usually advised to limit fat consumption to no more than 30 percent of their total day's calories. The 30 percent limit follows the Dietary Guidelines for Americans. Brewer acknowledges that not everyone needs 2,000 calories a day, especially people trying to lose weight. They often need to eat fewer calories to lose weight. She advises people interested in losing weight to see a doctor, dietitian or nutritionist first.