How to deal with this loss of appetite from depression and anxiety?

Try to normalize all: Aspects of your life as much as possible. Even if you aren't particularly hungry - still work to maintain an eating schedule. Don't isolate. Spend time w people. Use your support system. Get out. Don’t stagnate at home. Work to get 8 hours or > of sleep per night. Daily aerobic physical activity is a big +. Your dr can assess for mood disorder ; underlying medical conditions that may be causing.