Kamala Harris: I can work 15 hours a day with minimal sleep thanks to this morning routine.

Her consistent morning routine is a key factor in Kamala Harris's ability to handle 90-hour workweeks.

On Monday, Shannon Sharpe's "Club Shay Shay" podcast, Harris, the current U.S. vice president and Democratic nominee for president, revealed that she starts each day with two routines: a balanced breakfast and a workout.

"Harris stated that he typically works 14 to 15 hour days and exercises every morning, regardless of the amount of sleep he gets. He emphasized the importance of maintaining a healthy mind, body, and spirit, as this is the only time of day he truly feels in control."

In 2018, Harris did elliptical workouts or 30-minute SoulCycle sessions and her breakfasts consisted of generic, low-sugar Raisin Bran and tea with lemon. Currently, she prefers a spinach omelet, chicken apple sausage, and toast. "Then I'm gone," she told Sharpe.

DON'T MISS: The ultimate guide to negotiating a higher salary

These days, I often find myself in multiple cities in a single day, attending rallies with thousands of people and making calls to individuals.

Eating breakfast regularly can positively affect your mood and sleep quality, according to research. Blue zones, which have the highest life expectancy rates, prioritize breakfast consumption, as advised by longevity researcher Dan Buettner in a 2018 interview with Make It.

"According to Buettner, "Breakfast is the most crucial meal of the day because it provides the energy needed to complete the day and presents a chance to consume numerous nutritious foods to kick-start the day.""

It appears that Harris enjoys consistency, as evidenced by her adherence to a routine every morning and her practice of beginning all her meetings promptly.

"On Monday, leadership researcher Brené Brown's "Unlocking Us" podcast heard her say, "Being on time is really important to me. I've never seen an elected leader who is always on time, but I feel that I owe other people the respect of knowing their time is important.""

Earn more money at work by taking CNBC's online course on negotiating a higher salary. Expert instructors will teach you the necessary skills to increase your paycheck, including how to prepare, build confidence, communicate effectively, and craft a counteroffer. Start now and use the coupon code EARLYBIRD for a 50% discount through November 26, 2024.

Sign up for CNBC Make It's newsletter to receive expert advice on work, money, and life.