Sugar's reputation regularly fluctuates between not totally bad for you and literally the worst thing to eat. All of that back and forth makes determining how much of it you really should (or shouldn't) eat a little tricky. Eating too much sugar can lead to a whole host of potential health problems, but eating too little can be problematic, as well. Cutting back too much could lead to some weird signs you aren't getting enough sugar in your diet.
Ingesting too little sugar can result in, perhaps unsurprisingly, low blood sugar. A once-in-a-while low blood sugar experience probably isn't anything to worry about (unless it dips too low and your symptoms are severe — then seek emergency treatment). But according to WebMD, if you experience low blood sugar more than once in one week, you should call your doctor. Although you may think low blood sugar (the severe, ongoing condition is called hypoglycemia) only happens to people who have diabetes, Medline Plus noted that you can still experience low blood sugar, even if you don't have diabetes. Additionally, if you're not getting enough sugar in your diet, it may be because you've drastically cut your carbohydrate intake. Carbs break down into sugars, which, according to Harvard University's T.H. Chan School of Public Health's website, then enter the bloodstream. So not eating enough of them may cause you to feel the effects of low blood sugar overall.
If you're experiencing any of the nine symptoms mentioned here, keep track of them and try to stay ahead of them in the future. If need be, have a chat with your doctor to figure out what's up. Low blood sugar can be dangerous if it's really severe (or ongoing), but knowing the signs can help you address anything potentially problematic before it balloons into something major.