Question

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

Answer 1

Rule of thumb: amounts of per 100 gram 
Use the 'per 100g' when evaluating or comparing products in the supermarket, but remember, this may not be the size you eat! For example, you will need to make upward adjustments for a 200g tub serving of yogurt or downward adjustments for a 30g slice of bread. 

Answer 2

Answer:

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