Why does it seem more illnesses occur between the months of October and April? It actually has little to do with temperature change, or an increase in germs, and has more to do with your lifestyle. Ever notice how the flu explodes around the holidays? Starting with Halloween... Halloween has just passed and most of us still have bowls of candy on the table. From Halloween we go straight into Thanksgiving – a holiday loaded with high carbohydrate and high sugar foods (pies anyone?) and perhaps a higher consumption of alcohol.