Fair warning upfront: the calorie numbers here are ballpark estimates. Hard nutrition data for hawker lok lok basically does not exist, so treat the 70 cal per stick figure as a reasonable average, not a precise lab result. With that said, lok lok is genuinely one of the more manageable late-night snacks out there IF you pick sensibly. A boiled fish ball stick with light chili sauce is around 45 calories. Two of those and you have had a real snack for under 100 cal. The problem is that nobody stops at two sticks, kan. You get chatting, you keep pulling sticks out of the pot, and suddenly you have eaten 15 sticks and wonder why you are hungry again. The sauce is also sneaky: that 11g dip adds 22 calories per stick, and if you are ladling peanut sauce generously, that number goes up fast.
The thing that really changes the maths is the item type and whether it gets fried. A plain mushroom or leafy veg stick with no sauce is basically 15 calories. A sausage or squid ball stick with peanut sauce is 95. Deep-fried lok lok, which some stalls offer, can hit 130 per stick because the oil soaks right into the coating. So the same stall, same price per stick, can give you wildly different calorie totals depending on what you grab. If you are trying to keep it reasonable, load up on the fish balls, crab sticks, tofu, and veg sticks, go easy on the sausage and anything fried, and be stingy with the peanut sauce. It sounds obvious but most people just grab whatever looks good without thinking about it.