How a meal score is calculated
It’s helpful to understand that your meal score is a weighted average of the scores for each ingredient logged in a meal.
The weighting will depend on the number of calories each ingredient contributes. So, if an ingredient has a lower score and takes up a high percentage of the total calories, the meal score will probably be low. For example, 100g of lettuce would have less of an impact on the meal score than 100g of cheese because the cheese has a higher caloric density.
Why does this meal score Zero? Quick checks
It can be confusing to see a meal score of zero, especially when it contains plenty of nutritious foods and plants. If you're unsure why your meal is scoring zero, here are some things to check:
Review the quantity logged for each ingredient. If you spot an error, click on the ingredient to amend the amount, and see if this improves your score. When you log larger quantities of foods which are rich sources of fat, this can reduce your meal score as you exceed your personal fat threshold.
Make sure the serving size is correct for the amount you ate. You can amend the number of servings a recipe makes in your My Recipes section.
In most cases, reviewing the above will fix zero scores.
You can read more about how to improve a meal’s score in this article: What are the best ways to improve a meal's score?