Research reported in 1995 showed that cooking or heating food in microwave ovens can cause it severe molecular damage which, when eaten, leads to abnormal changes in human blood. These changes can cause deterioration of the immune system. In 1991, an extension service of the University of Minnesota warned against heating babies' milk bottles in microwaves for both practical safety and nutritional reasons: Heating the bottle in a microwave can cause slight changes in the milk. In infant formulas there may be a loss of some vitamins. In expressed breast milk some protective properties may be destroyed.
In New Zealand and Australia it is forbidden to erect mobile telephone transmitting masts on school properties. In California communications companies are advised not to install equipment near educational properties.
2. According to a 1999 report, in most European Union countries a high proportion of households had decided to do without microwave ovens for non-economic reasons.
2. Research by the National Radiological Protection Board of the UK has shown no proven health risks from mobile telephone transmitting masts.