Do not be in a hurry to rejoice if you suddenly began to lose weight and at the same time did nothing for this.
Experts have named Fit for Fun magazine dangerous reasons for sudden weight loss. Among them is a tapeworm infection. The parasites actually feed on you, and due to the lack of nutrients, you lose weight, but nothing good will come of it for you. Also, acute or chronic diseases, due to which appetite decreases, in particular, tuberculosis, can lead to a similar effect.
Inflammatory bowel disease, such as ulcerative colitis or Crohn's disease, and eating disorders such as bulimia or anorexia, can also contribute to weight loss. Undiagnosed food allergies (lactose, fructose, gluten intolerance) are another reason for unexplained weight loss.
If you are suddenly losing weight, it is also worth checking if your thyroid gland is working properly. If it is overactive, it produces too much hormones, which causes the metabolism to speed up. Latent oncological diseases of the pancreas lead to a similar effect.
Experts also claim that unexpected weight loss can be a sign of onset dementia. This happens because sometimes people with this ailment suffer from decreased appetite or simply forget to eat on time. Alcohol and illegal substance abuse, by the way, leads to a similar effect.