Inclusion Criteria:  At least 18 years old Fluent English speakers  Exclusion Criteria:  History of neurological conditions (e.g., epilepsy, dementia, multiple sclerosis, brain tumors, etc.) History of psychiatric conditions (e.g., general anxiety disorder, depression, schizophrenia, obsessive-compulsive disorder, post-traumatic stress disorder, attention deficit hyperactivity disorder, alcoholism, etc.) Significant medical illnesses (e.g., cancer, meningitis, chronic obstructive pulmonary disease, cardiovascular disease, etc.) Cerebrovascular risk factors (e.g., hypertension, diabetes, elevated cholesterol, etc.) Use of psychoactive medications (e.g., barbiturates, benzodiazepines, chloral hydrate, haloperidol, lithium, carbamazepine, phenytoin, citalopram, escitalopram, fluoxetine, diazepam, etc.) Smell or taste dysfunction History of severe allergies requiring hospitalization for treatment History of severe asthma requiring hospitalization for treatment Habitual smoking History of eating disorders (e.g., anorexia nervosa, bulimia nervosa, binge-eating disorder, etc.) Dieting or fasting History of sleep disorders (e.g., obstructive sleep apnea, narcolepsy, insomnia, etc.) Magnetic implants (e.g., shunts or stents, aneurysm clips, surgical clips, cochlear implants, metal bone/joint pins, plates and screws, eyelid spring or wires, etc.) Electronic implants (e.g., implanted cardiac defibrillator, cardiac pacemaker, deep brain/spinal cord or nerve stimulator, internal electrodes/wires, medication infusion devices, etc.) History of metal working without proper eye protection, or injury with metal shrapnel or metal slivers Left-handedness Claustrophobia