When your person is a bit blue, check the fridge. Give them groceries and they should then change. If not, I apologize.
If you are new and have no idea how to change their feelings of: "not feeling fresh" , dont worry! Just drag then to the shower or give them a small towelette from the flea market. Easy! They should change.
Also if you are new and they are hungry, drag them onto the dining table/island that's built in. They should then say preparing a meal and wait for then to set the table. Then drag all your family to the table for them to eat. They should say sitting down to a meal.
If they are depressed, praise them and/or give them a treat. Whether the dirty candy or bananas, it should work.
If they are elated, don't worry. That's good! It means proud or happy.
If they are a bit sick, don't waste your money on every medicine or that stephescope, either. Instead, drag ten to an empty space until they something unusual in the actions bar, like cant stop coughing or sneezing or itchy or upset stomach or head hurts. Then look through the medicine in the store until you find sown thing that sound like it would help. Throat longitez or that red/brown/maroon bottle that says respitory problems should help sore throat or coughing, the Advil thingy should help headaches, cortisone should help itchy, the pink bottle is for upset stomach, and the little white bottle without the green labels is for sneezing.