How to change a portion size.

You can easily change the portion size on the Grid:

1. Go to the Grid on the bottom of the screen.
2. Tap on a food.
3. The pop-up will display the food portion size and its macros.
4. You can adjust the portion sizes on the left.
5. You can switch the units by tapping on the Units button.
6. You can increase/decrease the portion size with the arrows. You can also tap on that number to manually change it. 
7. You can even identify when you ate the food by selecting the appropriate meal time.
8. Tap Eat to add the food to your Daily Logs.