Quickly add or subtract to existing food entry
Let's say I'm eating dinner and I have 137g of rice. I input it in the diary. I go back for seconds and have another 88g of rice. It would be great if I could tap into the existing entry and there was a + button I could tap to add the 88g to the existing 137g. Currently I either add a second entry, or I have to do the math in my head (or open the calculator app!).
This also happens a lot when I'm creating a recipe and decide I need more of a particular ingredient.