Sour cream / yoghurt / mayonnaise (separately or mixed), add curry / garlic / chili / herbs (separately or mixed).
Less the dipping kind, but nice with fish or meat, an oriental/ponzu style sauce: oil, soy sauce, lime juice, chili, chopped garlic. Edit: and fresh coriander!
Soy butter (with melted and browned butter plus some chopped shallot or regular onion) is also nice, primarily with fish.
Adding some wasabi powder to a sauce could liven it up as well.
Not much carbs in any of those?
Good going on the weight loss - best of luck!