*Damaged oils are the ones we have to be concerned about, not natural undamaged oils*
Like cooking with vegetable oils as a "healthy" alternative to lard and butter? A professor in England has some bad news: When you heat up oils such as sunflower or corn oil, they produce intense concentrations of chemicals known as aldehydes that have been associated with dementia, heart disease, and cancer, the Telkegraph reports.
"I was surprised as I'd always thought of sunflower oil as being 'healthy,'" chemistry professor Martin Grootveld told the BBC in July. In his study, Grootveld had people cook with various oils and fats and hand over the remainder for analysis at De Montfort University in Leicester, England; his team also heated the same fats and oils and compared the findings.