hi BeckyBoo,
well, in short, I think the answer most of us here would give is: no, he probably shouldn't be eating "almost anything". Many of us here, myself included, seem to find that you have to cope with diabetes on a number of fronts - medication might well help (although some diabetics don't take any medication at all), as will exercise (at least moderate exercise), and so will diet modifications, certainly.
Basically medication of the sort your fella is on will make a difference, but probably not THAT MUCH of a difference.
You'll find big arguments on this forum about diet, but I can tell you that DRASTICALLY reducing carbohydrates, especially bread, rice, potatoes, pasta, breakfast cereal, has greatly helped me. I mean, virtually cutting them out entirely.
Does your fella have a blood sugar meter and test his levels ? Because that's the other big thing that has helped me.