NOYU estimates, so it will sometimes be wrong. Correcting it is quick, and the whole meal recalculates as you go.
The fastest way is usually to say so in the chat: "that was a large flat white, not a regular", "there were two eggs not one", "the rice was about 200g". You can also edit directly on the meal.
What happens when you change a portion
Three different behaviours, and knowing which is which saves confusion.
Change the amount, same unit. Everything scales proportionally. Change 100g of rice to 200g and the calories, macros and everything else double. This is the common case and it does what you would expect.
Change the unit. The food is re-estimated from scratch. Going from "1 serving" to "150g" changes what the number is measured in, so scaling the old figure would be meaningless.
Give a nutrition figure yourself. Your number wins and scaling switches off for that food. If you have the packet in your hand, telling NOYU the calories is the most accurate thing you can do, and it will not then be overwritten by an estimate.
Adding something that was missed
Add the food and NOYU estimates it in place. Photos regularly miss a drink, a sauce or something eaten off-camera, and adding it afterwards is normal rather than a workaround.
Removing something
Delete any food and the meal totals recalculate. Deleting everything leaves the meal in place with no totals rather than removing it.
Deleting a meal
Deleted meals are tombstoned rather than erased. The meal stops counting towards anything, but if it was referenced earlier in your chat, that reference still resolves and shows as removed instead of breaking.
You can restore a deleted meal if you change your mind.
Logging something again
For anything you eat regularly, "log my overnight oats again" is the quickest path. NOYU finds it in the last 30 days and copies that meal's numbers exactly, with no re-estimation.
Two advantages: it is instant, and it is consistent. A meal you have already corrected stays corrected every time you re-log it, so your regular breakfast stops being re-guessed slightly differently each morning.
Editing on the web
The web edit form covers the name, amount and unit of a food. It does not expose the individual macros.
For a full correction, including specific nutrition figures, use the chat or the iOS app. The web nutrition page is otherwise a read-only view, and there is no manual "add a meal" form on web today.
Fixing the time or the meal type
You can change a meal's name, its type (breakfast, lunch, dinner, snack), its notes and when you ate it.
The time matters more than people expect. Anything looking at late eating and sleep uses the timestamp, so a dinner logged at midnight because that is when you got round to logging it will distort exactly the pattern you might be trying to see.
