A portion is the amount of food that you choose to eat for a meal or snack. On the other hand, a serving size is a specific and measureable amount of food.
A recommended serving size is a standardized unit listed on a product’s nutrition label. It should be the first thing you look at when it comes to label reading. The Nutrition Facts label tells how many servings are in each package, as well as the calories, protein, fat, carbohydrates, sodium, cholesterol, etc. based on that serving size.
A portion is the amount of that food item actually served or consumed. For example, a serving size of tortilla chips may be 9 chips. If you choose to eat 18 tortilla chips as your portion, you will need to double the information on the nutrition label if you want to know how many calories you’ve had.
Many people are surprised to discover that most 20oz bottled drinks actually have 2.5 servings in them. That is why label reading is so important! Reading the Nutrition Facts label on packaged foods can help you make healthier choices by choosing the right portions. hope this helps :)sorry if it doesn't
