Sleeping Late at Night: How Does it Affect Your Bellies.

Sleeping Late at Night: How Does it Affect Your Bellies.

You might want to rethink your bedtime if you’re concerned about belly fat and the health risks it carries. A large international study of middle-aged and older adults suggests that going to sleep late is associated with obesity and big bellies.

The study, published online on June 1, 2021, included almost 137,000 people of varying income levels from 26 countries. Participants answered questions about their sleep behaviors, with about 14% saying they went to sleep at midnight or later.

Compared with a bedtime between 8 p.m. and 10 p.m., a later bedtime was associated with a 20% greater risk of being obese (a body mass index of 30 or higher) or having a large waistline (35 or more inches for women, 40 or more for men). The risk was even higher (35% to 38%) among people who went to bed between 2 a.m. and 6 a.m. Long daytime naps were also tied to an increased risk for belly fat, especially among women. Going to bed earlier (before 8 p.m.) was not associated with obesity.

The study was observational and doesn’t prove that going to sleep late will cause weight gain. But it’s reasonable that it could: the researchers speculated that delaying bedtime can throw off your circadian rhythm (sleep-wake cycle), which increases levels of the stress hormone cortisol and may play a part in abdominal obesity.

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Acostarse a Altas Horas de la Noche: Como Afecta a su Abdomen.


Es posible que desee reconsiderar la hora de acostarse si le preocupa la grasa abdominal y los riesgos que conlleva para la salud. Un gran estudio internacional de adultos mayores y de mediana edad sugiere que irse a dormir hasta tarde está asociado con la obesidad y un alto crecimiento de grasa abdominal.

El estudio, publicado en línea el 1 de junio de 2021, incluyó a casi 137,000 personas de diferentes niveles de ingresos de 26 países. Los participantes respondieron preguntas sobre sus comportamientos de sueño, y alrededor del 14% dijo que se fueron a dormir a la medianoche o más tarde.

En comparación con la hora de acostarse entre las 8 p.m. y 10 p.m., una hora de acostarse más tarde se asoció con un 20% más de riesgo de ser obeso (un índice de masa corporal de 30 o más) o tener una cintura grande (35 pulgadas o más para las mujeres, 40 o más para los hombres). El riesgo fue aún mayor (35% a 38%) entre las personas que se acostaron entre las 2 a.m. y las 6 a.m. Las siestas largas durante el día también se relacionaron con un mayor riesgo de grasa abdominal, especialmente entre las mujeres. Acostarse más temprano (antes de las 8 p.m.) no se asoció con la obesidad.

El estudio fue observacional y no prueba que irse a dormir hasta tarde provoque un aumento de peso. Pero es razonable que sí: los investigadores especularon que retrasar la hora de acostarse puede alterar el ritmo circadiano (ciclo de sueño-vigilia), que aumenta los niveles de la hormona del estrés cortisol y puede desempeñar un papel en la obesidad abdominal.

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