Dr. Bijoy John Links Poor Sleep to Weight Gain in 1 TV Health Segment

Q: A 2026 study found a 7.3-hour sleep 'sweet spot.' How does this challenge the conventional '8 hours a night' advice?

The 2026 finding suggests the old “8 hours a night” rule is too blunt: for metabolic health, the best average may be closer to about 7.3 hours, not a universal eight. The BMJ Open Diabetes Research & Care study found an inverted U-shaped pattern, meaning both too little sleep and too much sleep were linked to worse insulin sensitivity. In that analysis, about 7.32 hours of weekday sleep was the point associated with the best metabolic profile. Sleeping less than that was associated with poorer glucose control, but sleeping more than that was also linked to higher insulin resistance. That does not mean 8 hours is “bad” for everyone. It means the standard advice should be treated as a broad guideline rather than a precise target. Most sleep experts, including those cited in the Nashville report, still recommend roughly seven to nine hours for adults, with strong emphasis on sleep quality, regularity, and treating disorders such as sleep apnea. The newer research also challenges the idea that duration alone is what matters. Studies now point to sleep consistency and timing as major factors in weight, hormones, and blood sugar regulation. Large weekend catch-up sleep, for example, may help a little if someone is sleep-deprived, but it is generally less beneficial than getting steady, good-quality sleep throughout the week. So the practical takeaway is not “replace 8 with 7.3” for everyone. It is that healthy sleep is more individualized, and more is not always better.

1 articles · Updated · News Channel 5 Nashville · Jul 15

Dr. Bijoy John said poor sleep can contribute to weight gain, making sleep quality a key part of overall health.
The Nashville TV segment framed sleep as one of the most beneficial habits for health and focused on how inadequate rest can affect body weight.
John, who practices at Sleep Wellness Clinics of America in Brentwood, also directs viewers to his book, "Nobody’s Sleeping: 7 Proven Sleep Strategies for Better Health and Happiness," for more guidance.