Category: Circadian rhythms

According to a study published in the journal *Cell Metabolism*, eating later in the day can cause the body to burn less fat and calories, and store more fat. This research sheds light on the complex relationship between our body's internal clock and how it processes our first meal, suggesting that timing does, indeed, matter.

According to a study published in the American Journal of Clinical Nutrition, our body's internal clock naturally ramps up our appetite and hunger in the evening, independent of food intake, which helps explain the phenomenon of why am I hungry in the evening but not in the morning. This endogenous cycle, driven by hormonal fluctuations, plays a significant role in determining when we crave calories most throughout the day.

According to a study published in the journal *Annals of Internal Medicine*, even a small sleep deficit can disrupt the body’s hunger-regulating hormones, a key reason why you might be so hungry during daylight savings time. The subtle, bi-annual shift in the clocks throws off your body's internal timing system, leading to temporary but powerful changes in appetite and food cravings.

Studies show that our body's internal clocks, or circadian rhythms, significantly influence how we process food. This means the question of *how many hours do humans need to eat* is more complex than a simple number, involving your body's natural metabolic responses and daily routine.

According to a 2017 study by Northwestern University, evening exposure to blue-enriched light was associated with an increase in subjective hunger and altered metabolism. Far from suppressing appetite, research indicates that blue light, particularly at night, can interfere with the hormonal signals that regulate hunger and fullness.

According to the CDC, jetlag symptoms like fatigue and headaches often appear within 12 hours of crossing three or more time zones. A lesser-known but equally common symptom is a suppressed appetite, leaving many travelers to wonder: does jetlag make you not hungry? The answer lies in the deep connection between your body's internal clock and its digestive system.

Studies suggest that our body's internal clock, or circadian rhythm, significantly influences metabolism and hormones. This biological timing system helps explain why is it easier to eat healthy in the morning and why mindful food choices feel more natural early in the day.

While the average eating window has expanded, leading many to eat late, emerging research from institutions like NYU Langone and Harvard indicates that aligning meals with your body's natural circadian rhythm can significantly improve metabolic health. This has many asking: should I eat dinner at 3PM? The answer, as it turns out, is more nuanced than a simple yes or no, balancing potential health benefits with practical lifestyle considerations.

According to a 2025 study published by Cedars-Sinai, eating the first meal of the day as early as 8 a.m. can help with blood sugar regulation and reduce the risk of heart disease. But what time is the morning meal truly best for your body, and does it matter if you are not hungry when you wake up? The answer depends on a combination of your internal body clock, lifestyle, and health goals.

According to a study published in the American Journal of Clinical Nutrition, many people's internal body clocks naturally suppress appetite in the morning and peak in the evening. However, some individuals experience the opposite, leading to the question: why do I never feel hungry in the evening?