Now are you saving money? Not particularly. The food which is better for you is also a decent amount more expensive. On top of the 1k per month the meds cost. Now many people can get the meds covered by insurance but some cant.
Cost wise it is pretty much a wash. As you are eating less but you are spending more. So there could also be people are watching what they eat more closely in addition to the medication.
My wife also says it is a change of diet not a diet.