If you lose 1.2 kg on the basis of following a healthy diet and proper exercise, it is normal, and even a gradual slimming. However, if you don't have a healthy diet and exercise, or lose weight faster than this, you need to pay attention, which may be related to some health problems.

For example, the obvious weight loss in a short time may be related to some diseases, such as diabetes, hyperthyroidism, digestive tract diseases and so on. In addition, if you feel tired, loss of appetite, headache or other physical discomfort, you should also seek medical advice in time.

Generally speaking, if you lose weight 12kg within three months, but feel in good health, it may be normal. However, if you feel unwell or lose weight too fast, it is recommended to seek medical advice in time.