依据身体质量指数高于或低于25，研究员将参与者分成了两组：偏瘦组和超重组。
Researchers divided the groups into two categories: lean and overweight, depending on whether their BMI was above or below 25.
依据身体质量指数高于或低于25，研究员将参与者分成了两组：偏瘦组和超重组。
Researchers divided the groups into two categories: lean and overweight, depending on whether their BMI was above or below 25.
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