So, we chatted with registered dietitians to determine the difference between the two terms, why it matters, and how to let a serving size guide you to enjoying a portion size that meets your ...

Luckily, personal trainer Max Weber, ACE, NASM, shared a helpful tip on his Instagram for how to eyeball your portion sizes for each meal — all you need is your hand.

The serving size on a nutrition label is based on the amount of food people typically eat in one sitting. It isn't meant to be a recommendation.

To do it accurately, you have to precisely calculate serving sizes, which sometimes requires a food scale or other measuring tools.

Researchers analyzed 96 national dietary guidelines and found that different methods used to determine portion sizes lead to minimal variation, with regional factors like cost and culture having a ...