There are mostly two type of sauces at Chinese restaurant. Red or White. The red is usually syrup and the white is usually corn starch.
My choice would be the white and have some type of chicken and veggies. If you can get enough to eat without the rice or eggroll which are usually the filler carbs. You can also eat the insides of the eggroll and throw away the wrap.
It's hard to eat well there, I've tried. I've asked for stir-fried dishes with sesame oil and maybe chili paste but I didn't get it. They didn't even have sesame oil...
They're pretty set in their ways.
Good Luck!