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Serena Williams prefers to steer clear of the term “diet.”

The 43-year-old tennis star explains during a phone call from Florida: “Every time I try to diet, I end up gaining weight. I don’t even like to use the word diet.” Although she avoids that term, she is very focused on her health, especially as a mother to Olympia, who is 7, and Adira, who is just 1.

She states, “Since I’ve stepped back from tennis, I’ve become absolutely passionate about being healthy, eating well, and living a healthy lifestyle. Plus, I’ve got a farm!” Part of her health journey involves using Lingo, a continuous glucose monitor (CGM) produced by Abbott, which helps track blood sugar levels. This device highlights that everyone reacts differently to specific foods, and some studies suggest that even those without diabetes might find it beneficial to monitor their blood sugar levels. Changes in glucose can significantly affect mood swings.

The use of CGMs for those not diagnosed with diabetes is gaining popularity. However, some health experts are skeptical about whether this trend is genuinely beneficial for everyone.

Understanding CGMs

Continuous glucose monitors (CGMs) are small sensors positioned under the skin of your arm that relay data to your smartphone, providing insights into your blood sugar levels. Typically, they are worn for one to two weeks at a time. While primarily used by diabetics, some CGMs can connect to insulin pumps. The price of these devices varies widely, with some costing thousands of dollars annually out-of-pocket; however, some insurance plans may cover their use.

Williams and her husband Alexis Ohanian have gathered valuable insights regarding how certain treats affect their glucose levels—such as gelato and pancakes. “I noticed that gelato didn’t spike my levels too much, which might not be typical, but seems to be my normal,” she says. “On the other hand, pancakes and syrup did lead to a significant spike.”

Dr. Robert Shmerling, a senior faculty editor at Harvard Health Publishing associated with Harvard Medical School, mentioned to YSL News that he believes the marketing behind continuous glucose monitoring has outpaced the scientific backing. He explains that, for those without diabetes, the current research does not substantiate the effectiveness of CGMs. Nonetheless, individuals like Williams who are using them may still find value in their results.

“We’re all considering longevity”

Williams understands that people adopt various methods to improve their health. For her, this approach works well: “Everyone is discussing glucose levels and different methods to monitor them. I found this was a fascinating way for me to track it. What works for others is perfectly fine for them.”

As a mother of young children, she aspires to remain energetic and involved in their lives. “We’re all concerned about longevity and the resources available to help us achieve it, but maintaining good health is something we have to actively pursue,” she shares. “Right now, I’m on a personal journey focused on working towards that goal and creating the best possible situation for my health.”