AP BIOLOGY

Detailed explanation-1: -The circadian biological clock is controlled by a part of the brain called the Suprachiasmatic Nucleus (SCN), a group of cells in the hypothalamus that respond to light and dark signals.

Detailed explanation-2: -In the circadian diet, you eat during a 12-hour window–typically between 7 a.m. and 7 p.m.–and fast during the other 12 hours. Meal sizes are flipped, with breakfast the largest meal of the day and dinner the smallest. That 12-hour nightly fast eliminates after-dinner snacking and midnight raids on the fridge.

Detailed explanation-3: -What are circadian rhythms? Circadian rhythms are physical, mental, and behavioral changes that follow a 24-hour cycle. These natural processes respond primarily to light and dark and affect most living things, including animals, plants, and microbes. Chronobiology is the study of circadian rhythms.

Detailed explanation-4: -A typical circadian rhythm in humans is one where peak alertness is around 2-3 hours after awakening and 8-9 hours after awakening, and where fatigue is most likely at around 3 AM, if you wake up like most people do at around 7-9 AM in the morning. However, this rhythm is impacted by many factors and it can be shifted.