What is the rule of thumb for total fat per serving?

According to the law, fat-free foods should not have more than 0.5 grams of fat per serving. While low fat foods should have 3 grams of fat or less per serving.

Explanation:

Fats are those nutrients that food has and that is used for the construction of cell membranes, nerve tissue and hormones. Fat is also used as fuel. If this fat is not burned or used for the construction of body components, it is stored in the form of fat cells. Fat-free foods should not have more than 0.5 grams of fat per serving. While low-fat foods should have 3 grams of fat or less per serving