[header] How to know if someone is depressed but faking happiness [title] Notice whether the person's eating habits have changed. [step] Many people who are depressed start eating more or less than usual. They may also start making uncharacteristic choices about which foods to eat. 
[substeps] For example, if someone who usually cooks healthy meals starts living on a diet of convenience food, they may be depressed. If you don't see what your friend or family member eats on a regular basis, pay attention to changes in their weight, which can indicate over-or undereating.