For me it means avoiding as many carbs as possible. I'm eating high fat (mostly animal). I'm not counting carbs but would imagine I'm around 20g a day.
As for the expense of eating well, I believe that is partially by design. An unhealthy herd is more reliant on the Shepard. It is also a major benefit to pharmaceutical companies.
I hope you find your path and feel free to vent anytime along the way.