It isn't described as "safe" because according to the NHS there is no safe drinking level. The type of illnesses you can develop after 10 to 20 years of regularly drinking more than 14 units a ...

For people who quit after drinking 1.5 drinks per day or less, their LDL rose 1.10 mg/dL, and their HDL fell by 1.25 mg/dL. Quitting after drinking 1.5 to three drinks per day led to a rise in LDL of ...