A sudden, drastic change in weight can be an indicator that medical attention is necessary.
I do not mean “my weight is up a quarter pound today!” Nor do I mean “I lost 5lbs in the last few months!” Small, gradual changes up or down is usually in response to natural goings-on like aging or changes in your daily routine. For example, I gradually lost 10lbs when I started chasing toddlers working in a day care center in college. That was small, gradual, and had a reason.
Contrast this with, say, losing 20% of your body weight in 3 months.
…and diet hasn’t changed much.
…and exercise hasn’t increased.
…if anything, it’s decreased, because you’re very, very tired most of the time.
…and you’re also very thirsty…
This happened to an in-law recently. She was thrilled with her weight loss. She thought she was finally getting healthy. Actually she had developed diabetes and her blood sugars were sky-high.
I realize that not everyone is comfortable weighing themselves. Note again this isn’t about changing a pound or two. Many people can tell by how their clothes fit or looking in the mirror whether one’s weight has changed by a large amount. If you are comfortable that you would know if you had a sudden change in weight, then scales aren’t really needed.
I don’t trust myself to “automatically” notice. Why? Well: About 12 years ago I had a major depression episode over a few years where I gained 35lbs. I didn’t notice until I got weighed at my doctor’s office. The man I was dating at the time thought I’d gained 10lbs but didn’t mention it to me. I had thought I might be depressed but not too bad, because I hadn’t gained weight. Um…no, I just hadn’t noticed.
Then 6 years ago I lost 30lbs on the Atkins diet and nobody noticed* (except me, because I was weighing myself every day).
So yes, I do get on my scale** every few months. It’s accurate to plus or minus .5%, which means it can easily vary plus or minus 2lbs. That doesn’t matter for my purposes. But I know whether my weight is generally stable or not.
*I went down a bra size, but the rest of my clothing still fit fine. My waist size is 10″ bigger sitting than standing due to my belly, so I am an elastic-waist girl.