I like to scan the menu to see what lo-carb items are offered with other entreés and always ask for substitutions instead of 'hold the ...'
So instead of a burger with no bun, I'll say a burger, but instead of a bun can I have the steamed veggies? Or instead of the fries can I have some coleslaw? Or instead of the toast and hasbrowns, can I have some fried onions and peppers? I have found that they never say no ... this way you get your moneys worth rather than just less food.