Sugar and dairy products are categorised as the two most damaging 'items' for human body as it would cut off good vitamins in the body.

Swiss medical expert Dr Thomas Rau said sugar did not only cause diabetes but could be the reason for cancer cells to grow.

"Sugar is a processed food, it is not healthy and harmful for the body. The daily carbohydrate that we consume is far enough for the body to work as it already contains sugar.

"The daily intake of white sugar should be zero while for brown sugar you may take just about two per cent only," he said at his public talk here, today.

Dr Rau who treated his patients by using biological medicine said, almost 60 percent of human was allergic to dairy protein but never realised it.

He said this was because the symptoms were not shown just by vomitting but through susceptibility of infection at all time.

"The immune system of people who is dairy intolerant will get disturbed as dairy intolerance take so much of their immune system to work against the intolerance. In the end, they don't have immune system left for other use," he said.

Through biological medicine, a system of diagnostic and therapeutic methods that focuses on the body's own regulatory mechanisms, Dr Rau said patients were treated by using three pillars -- detoxification (restoration of regulation), building up the immune system and rebuilding the organ.

However, results of the treatment provided would vary depending on the types of diseases, he said.

In his talk, the medical director of Switzerland-based Paracelsus Clinic said the most frequent cause of diseases such as diabetes and coronary heart was due to toxicity that blocked the regulation and healing capacity of the body.

Such example of toxic, he said was mercury that would lead to various health issues including neurological, mental as well as skin problems.