The time of day you choose to exercise may have a great deal to do with control of blood sugar levels as well as cholesterol. Our internal clock mechanism is controlled and synchronized by not only sleep and light but also by the type of food we consume. Most past studies dealt with the time of day we ate and presented very different results. Some encouraged exercise before breakfast while others showed the benefits by working out later in the day on both blood sugar levels and heart rate. Most of these studies did not factor in the type of meals being eaten. A new study published in “Diabetologia” was performed at The Mary Hopkins Institute of Health Research in Australia. It involved 24 sedentary, overweight men who had all their vital statistics recorded before the experiment began. They were placed on a diet of 65% fat for five days and were then invited back to have all their vitals recorded once more. This was a diet that included extreme amounts of fat to concentrate on how the body would use fat during exercise. They were then divided into three groups. One group started their exercise routine at 6 AM, the next at 6 PM and the last remained sedentary. The exercise routine was identical. After five days they were again tested. Both, the sedentary and the 6 AM workout group had dangerous increases in cholesterol levels as well as the markers for heart disease. The group that worked out at 6 PM showed less of an impact of the poor diet. Their cholesterol, blood sugar levels as well as the molecules which are markers for heart disease were all lower. The study did not reveal how or why the time of day affected fat metabolism. This study did not encourage the intake of high fat diets which have been proven to be extremely unhealthy.