I have found that most experts say that we need to cleanse at the beginning of each season or every three months.  Dr Group is one of the experts that agrees that we cleanse every three months.  There are many reasons why we need to cleanse. Our bodies produce internal toxins known as free radicals.  These free radicals are easily produced when we inhale polluted air.  Our metabolism tries to kick out these toxins which may inflame our body if they are not disposed of quickly.  Our body also has to deal with the high fat and sugar content of food. The liver and colon and other organs have the ability to detox these pollutants. On the other hand, there are times when we need to add natural products in nature which will help combat the junk food and pollutions we take in. Take a look at the Dr. Groups website that you might find helpful.