Dr. Michael Doyle has found that the most effective way to help his patients is to focus on nutrition, hormones, and lifestyle. First, he looks for factors in these areas that are contributing to or causing illness. For example, deficiencies of key nutrients can cause many symptoms and conditions. Similarly, hormone problems, especially hormonal deficiencies are common causes of illness. An unhealthy lifestyle can, of course, contribute to or cause many health problems. When such problems are identified, the solution is usually obvious, if not always easy.