The threat of pesticide residues on food to human health is low, according to Carl K. Winter, a food toxicologist with UC Davis Cooperative Extension. Although there are valid concerns about pesticides in terms of worker safety and harm to the environment, Winter believes consumers have little to worry about because very little residue appears to be present at the time food is consumed. However, infants and children may face greater risks, because they consume larger amounts of fruits and vegetables with respect to their size than adults, and because they may have different sensitivities to pesticides and other chemicals. Parents concerned about pesticide residues should rinse produce under cold, running water, Winter says, but he discourages the use of soap. "The risks from large levels of soap residues are probably much greater than the possible pesticide risks." Peeling will reduce pesticide levels in many cases, but it may also significantly reduce the nutrient content of the food, Winter says. While some may worry about pesticide residues in the diet, "there are a lot more potentially dangerous things we overlook, particularly the microbiological contamination of food with bacteria, fungi and viruses."