I feed my kids really healthy food (hardly anything processed, lots of fruits and veggies, etc) and almost zero junk food and I use mainly natural cleaning products...I am very concious about health...we don't use air fresheners, dryer sheets or other products known to cause problems. However, both myself and my kids catch a fair number of colds over the year and a flu or two as well. I am pretty careful about handwashing with soap and water and I clean as much as is possible...I don't know what else I could do to prevent illness. Some people catch more things than others and it is not always about what they eat or don't eat or the lifestyle they live. That said, there can be environmental or nutritional reasons for kids getting sick a lot, but not always and it doesn't mean it is the parents or the kids' fault.