Grant Rodgers can be found on a Folk Legacy recording singing 'Bread and Gravy'. Just ask Sandy.
But after enjoying many of these songs for years and enjoying their subject better, Shel Silverstein's 'Diet Song' comes to mind. It strikes as close to the bone as it can get these days.

Breakfast: black coffee, one slice of dry toast, no butter, no jelly, no jam;
Lunch: just some lettuce, two celery stalks, no booze, no potatoes, no ham;
Dinner: one chicken wing broiled, not fried, no gravy, no biscuits, no pie;
And this dietin', dietin', dietin', dietin' sure is a rough way to die.

So pass me a carrot stick, peel me a prune, one glass of skim milk and that's all.
Turn off the TV for the Big Mac commercial; it's drivin' me straight up the wall.
I'm thinkin' of French fries, sausage and waffles, spaghetti, and cookies and cake,
And each night I'm dreamin' of chocolate ice cream 'n' I'm starvin' to death when I wake—
All for your sake.

Well, you're fixin' the kids all those creamed mashed potatoes, but it's bullion and water for me,
And you've got a lock on the refrigerator; Lord knows where you're hidin' the key,
And while I am starvin' for food late at night, I'm starvin' for lovin' from you,
But you say that when I can see my own dick you'll be back to look at it too.

So, suffer two pieces of cauliflower raw, some beefsteak the size of a nail,
One slice of tomato, a small dab of slaw, Lord, I swear I ate better in jail.
Stop eatin' that pizza right under my nose; girl that's the least you can do,
And put down that candy bar while I am singin'; I'm starvin' my ass off for you.

And when I am dead, with the insurance paid, you'll look down at me and you'll grin.
You'll say:"Well, the boy tried, and he starved and he died, but don't he look good when he's thin?"