A crucial part of healthy eating is understanding what a reasonable portion size looks like to create a balanced relationship with food.
Using hands to measure portions is a good approach for most people who don’t need very specific amounts of foods or macronutrients.
Why your hands you ask?
Hands are a consistent size, providing a consistent reference, and hands scale with the individual.
Bigger people need more food and have a tendency to have bigger hands, so they also have larger portions.
A smaller person needs less food and tends to have smaller hands, so smaller portions are served to them.