Quick answer: additional fatty tissue can supply increased lipid levels, including cholesterol, which is the basis for sexual hormones synthesis. Moreover, fat tissue can itself synthesize some feminine hormone lookalikes that can trigger early puberty (this is also why obesity is a factor influencing male hormones).
Material_Mongoose339 t1_ixz00dk wrote
Reply to Why do children with a higher bmi start puberty earlier? by -LoveMeMore
Quick answer: additional fatty tissue can supply increased lipid levels, including cholesterol, which is the basis for sexual hormones synthesis. Moreover, fat tissue can itself synthesize some feminine hormone lookalikes that can trigger early puberty (this is also why obesity is a factor influencing male hormones).