You have to get your calories (ie raw energy) from somewhere. If you limit saturated fat to 10% then what's left for the other 90% is (roughly speaking) unsaturated fat, simple sugars, carbohydrates (ie complex sugars), and protein. In terms of long term habits converting protein to calories is probably not a great choice for your health. If you decide to go for complex carbohydrates over various oils then vegetables that provide those are a good option.