Make the next food decision smaller. Choose the simplest preparation, keep your next meal available and protect the regular meal in your plan. You do not need to catch up on every app task to continue.
If stress makes you miss meals, focus on having your planned meal ready. If it brings a familiar snack urge, keep the planned portion nearby and notice whether you also need a break. If it makes your schedule unpredictable, use a flexible meal window.
Different people respond differently to stress. A shake or bar does not treat stress or anxiety, and eating should not become a punishment or a test of discipline.