Emily Manoogian Sleeps, Eats, and Thrives with Circadian Rhythms in Mind

Why It Matters

Aligning daily behaviors with circadian cues offers a scalable way to reduce chronic disease risk, especially for shift workers, making it a critical focus for public health and workplace policy.

Key Takeaways

• Circadian rhythms regulate metabolism, sleep, and eating patterns.
• Time-restricted feeding can improve health, especially for shift workers.
• Light and food are primary external cues syncing body clocks.
• The My Circadian Clock app tracks meal timing for research.
• Misaligned rhythms increase disease risk, highlighting need for alignment.

Summary

The Beyond Lab Walls podcast features staff scientist Emily Manoogian, a chronobiologist in Satchin Panda’s lab at the SulkQ Institute, discussing how circadian rhythms shape everyday health. Manoogian traces her path from a rural California upbringing and a love of animals to discovering chronobiology in college, eventually moving from hamster models to human studies focused on time‑restricted feeding.

She explains that virtually every metabolic process follows a roughly 24‑hour cycle, with light and food serving as the two dominant external cues that synchronize central and peripheral clocks. Misalignment—common among shift workers, people in extreme latitudes, or those with irregular sleep—can disrupt glucose handling, fat metabolism, and increase risk for chronic diseases, including cancer. The lab’s human trials, such as the “healthy hero” firefighter study, demonstrate that aligning eating windows with natural rhythms can mitigate these risks.

Manoogian highlights practical tools like the free My Circadian Clock app, which timestamps meals to capture timing data absent from traditional food logs. She also notes that melatonin supplementation can help blind or light‑deprived individuals re‑entrain their clocks. The firefighter study revealed that shift workers, despite starting healthy, develop cardiometabolic disease earlier, underscoring the need for targeted interventions.

The conversation signals a shift from academic curiosity to actionable health strategies: employers can redesign shift schedules, individuals can adopt time‑restricted eating, and clinicians can incorporate circadian assessments into routine care. As research moves from hamsters to humans, the potential for low‑cost, behavior‑based interventions to improve longevity and disease outcomes becomes increasingly tangible.

Original Description

Emily Manoogian, PhD, has made a career out of asking when. Manoogian is a chronobiologist—a fancy word for someone who studies circadian rhythms. As we go about our daily lives, sleeping, eating, exercising, and more, our bodies respond by tuning internal biological clocks. Our habits can make or break these clocks, and Manoogian is finding out exactly what and when those habits are so we can optimize our circadian rhythms for long-term health.