According to Dr. Preeti Jain, Senior Dietitian at Action Cancer Hospital, "It is highly recommended to not overdo vegetables while cooking or burn bread when put in toaster. The idea behind the same is to reduce the amount of compound acrylamide that is formed, which is a chemical that lives on food that contains starch, like breads and potatoes. It's yet to be scientifically proven that foods like these contain chemical that are linked to cancer. It's better to avoid cooking them at high temperatures as foods like these are not counted under the healthiest snacks available."
It is highly recommended to not overdo vegetables while cooking
According to the World Health Organization (WHO), while the information on levels of acrylamide in food is incomplete, the magnitude of the cancer risk posed by the compound hasn't been quantified; however, several principles must be applied in order to minimize whatever risk exists, one of them being foods shouldn't be cooked excessively, that is for too long or at high temperature.
So, even if it hasn't been proved that acrylamide may be linked to cancer, it does not mean that is isn't unhealthy for you. Always prefer eating golden brown toast, not only to enjoy health but also the taste; after all who'd like the taste of a burnt toast?