California and New York are on the cusp of going further than the FDA in restricting the sale of non-prescription diet pills to minors as pediatricians and public health advocates try to protect kids from extreme weight-loss gimmicks online. A bill before Gov. Gavin Newsom would bar anyone under 18 in California from buying over-the-counter weight loss supplements — whether online or in shops — without a prescription. A similar bill passed by New York lawmakers is on Gov. Kathy Hochul’s desk. Neither Democrat has indicated how he or she will act. If both bills are signed into law, proponents h…