How to set calories for iphone?

Set in apple Mobile Health App. Set daily exercise goals in the health app, and there will be reminders if you don't consume enough calories.

Health apps collect health data from your iPhone, Apple Watch and the apps you use, so you can easily check all your progress in one place. Health will automatically calculate your steps, walking distance and running distance.

In iOS 14, after setting your health information, you can first view your health list from the Summary tab. With the Health Checklist, you can view and enable available health functions. You can also click on the personal portrait in the upper right corner, and then click "Health List" to visit.