The reason is not 'a mystery'. US food is shittier, it's over produced and it's fatty and high in salt and all sorts of shit hence diabetes and obesity and heart disease.
Ta da!! Why they didn't ask me so this mystery was easily solved I will never know.
A progesterone hormone injection, used to prevent preterm labor, used to be $10 a shot. Now that the FDA has assigned an exclusive right to create the easily-made formula to one company, KV Pharmaceuticals, the price has risen to $1500. Almost all of it is pure profit, and KV Pharma did not develop the drug or pay for its trials: the taxpayer did, via the National Institute for Health. It is said to be the only drug proven to prevent pre-term birth, and an expert cited by ABC News suggests that the profession was snookered into supporting the assignment as a quality standardization measure.