Rarely, it's not something I've ever really think about especially since my weight doesn't have an indication to what I actually look like, since I'm quite heavy, but I look smaller than expected it's always been that way since I was young. (muscle mass mainly)
Although weirdly from the times I have checked (at least 2 to 3 times a year) my weight has always been consistent and has been for the last 8 years, despite my fat distribution and ratio changing here and there., which makes me think I've lost weight, but then I check and it's the same as before.