Why eating with the clock may be the simplest ‘biohack’ in the book.
We’ve been told that longevity lives in the details of what we eat. But the bigger lever might be when we eat.
Misaligned meal-times – especially late‑night eating – can throw your internal clock out of sync, with ripple effects on sleep, metabolism, and even blood pressure. The fix? A simple 10-to-12 hour eating window that tracks with your circadian rhythm.
“The circadian rhythm is the body’s internal 24-hour clock, regulating everything from sleep and hormone release to digestion and energy levels,” explains Dr Mariel Silva, director of medical services at SHA Spain, the global pioneer in integrative health. While this rhythm is centrally controlled in the brain, it also runs through “peripheral clocks” located in most organs – and food plays a surprisingly powerful role in keeping the entire system in sync.
“Alongside light exposure, when we eat is a key signal that helps regulate these internal clocks – particularly those linked to metabolism,” explains the doctor, who holds a masters in anti-aging medicine. Eating by the clock drives more efficient digestion, blood‑sugar regulation, and energy use, with recent studies showing it can lower blood pressure and support heart health, too. Conversely, irregular eating habits can lead to circadian misalignment. “Over time, this may interfere with hormones such as melatonin, affect sleep quality, and increase the risk of metabolic issues, including weight gain,” Dr Silva continues.
Rather than limiting what you consume, “circadian fasting is about synchronizing restriction with one’s environment,” explains nutritional therapist Mark Bennett, lead nutritional scientist at wellness coaching platform Wilding Tribe. Quite simply, it means intentionally eating “between sunrise and sunset.»
For famed human biologist and founder of The Ultimate Human Wellness, Gary Brecka, circadian fasting “calms late‑day cravings, improves sleep, and makes recovery more predictable with better HRV” (or heart rate variability – a window into the body’s stress and recovery systems). “I front‑load calories earlier in the day,” he says; “keep my eating window to roughly eight-to-10 hours in daylight, and stop eating two-to-three hours before bed.»
While Brecka may fast for marginally longer than others observing a time-restricted eating plan, the approach is still far from punishing. But what reads like the simplest biohack in the book feels complicated when you consider the logistics of long-haul travel. “In individuals who travel frequently, circadian disruption is common, particularly when crossing multiple time zones,” Dr Silva explains. The solution here is to use food to help the body adjust. “One of the most effective strategies is to shift your mealtimes to match your destination as soon as possible,” Dr Silva says.
Bennett agrees. “Once on the plane, immediately adjust your watch and devices to the current time at your destination and aim to eat your meals from that point onwards as if you were there.” Avoid eating if it’s nighttime at the new location; upon arrival, “aim to get morning, noon, and late‑afternoon sunlight exposure as soon as possible.”
To further support your alignment, Dr Silva advises prioritizing “foods that support alertness and sustained energy” by day, highlighting complex carbohydrates “including oats, brown rice or buckwheat, which can help reinforce the active phase of the circadian cycle”. Then, come evening, lighter meals can help signal to the body that it’s time to unwind. “Foods rich in tryptophan, including bananas, legumes, and nuts, support the production of serotonin and melatonin – both of which play a role in sleep regulation.”
Regardless of time zones, Brecka keeps a consistent morning routine – breathwork, movement, and a few other cues: “Your body learns the routine as a signal for ‘daytime’, so it travels well.” He gets outside for natural light within the first hour of waking, easing into the day instead of “blasting” his brain with blue light. Then, he caps caffeine early, and bookends bedtime in the same way – think “no screens in bed, room cool and dark, cotton sleep mask.»
Consistency is key, he’s learnt. “Those small, repeatable cues are what keep circadian rhythm tight: light early, stimulation paced, a portable morning ritual, caffeine discipline, and a predictable wind-down.”
As Dr Silva adds, “aligning our daily habits with our biological rhythms can significantly improve overall health” – and fasting when it’s dark may be the simplest way to start.
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