MSG (monosodium glutamate): MSG may increase appetite, promoting hunger and food intake; however, for some people it has been linked to side effects such as headache and digestive issues Cinnamon: cinnamon contains hydroxychalcone, which may help to increase appetite; however, there is not much research to prove this claim, and other studies have actually concluded that cinnamon can play a role in decreasing appetite Cardamom: cardamom may help to increase appetite, potentially because of its fragrant odor, which is thought to stimulate hunger Fennel: similar to cardamom, fennel’s aromatic odor may help to increase appetite