Can my goals automatically change based on my fitness activity?
You can have your calorie goal automatically adjust based on "Active Energy Burned" data that's available from the Health app. If you have an Apple Watch, this metric is often equivalent to the "Move ring".
You can enable this setting from your calorie goal's setting screen (see "How do I create and edit goals?"). If you have an automatic calorie goal, you can choose "Read from Health App" for the "Activity Energy" setting. If you have a custom goal, select "Active Energy" in the "Calories Burned Adjustment" section.
Active energy data is read from Apple Health periodically, so you may observe a small delay between what the Health app and FoodNoms.
Automatically adjust macro goals
To have your macro goals automatically adjust as well, enable the "Relative to Calorie Goal" setting.