Chemicals found in shampoo and other cosmetics can raise women's risk of diabetes by nearly two-thirds, according to new research. Those with higher levels of phthalates in their urine were up to 63 percent more likely to develop the metabolic disease, a study found.
They improve the durability of plastics - and are widely used in personal care products, children's toys, food and beverage packaging. Phthalates are even added to fragrances to help the scent last longer on the skin.
Known as EDRs (endocrine disrupting chemicals), they mimic oestrogen and have been linked to breast and ovarian cancer, as well as an early menopause. Lead author Dr Sung Kyun Park, of the University of Michigan, said: "Our research found phthalates may contribute to a higher incidence of diabetes in women - especially white women.
"People are exposed to phthalates daily increasing their risk of several metabolic diseases. It's important we address EDCs now as they are harmful to human health."
They may also change how we store fat, leading to obesity. Some phthalates have been found to cause infertility. One trial even found women are more likely to give birth prematurely if they have high levels of phthalates in their bloodstream before conceiving.
An analysis of 1,308 women across the US showed above average concentrations raised incidence of type 2 diabetes by 30 to 63 percent. The form is linked to unhealthy lifestyles. About five percent of participants developed it over the six year period.
Dr Park said: "Our research is a step in the right direction towards better understanding phthalates' effect on metabolic diseases, but further investigation is needed."
The additives, used during the manufacturing of plastic, have been detected in numerous everyday products ranging from bottled water to floorboards. Some have already been banned due to concerns about their safety. Previous studies have largely been carried out on rodents.
The study was peer reviewed for publication in the Journal of Clinical Endocrinology & Metabolism.
