The Short Version
The evidence does not support the claimed 25%/75% adult weight split in the Bogalusa Heart Study. Cohort-wide figures cited in the underlying literature are far lower than 75% overweight/obese in adulthood, including about 42% in one young-adult analysis and 57.7% overweight in another follow-up measure. The claim appears to misread subgroup tracking results as if they described all participants.