Where was the control group? Did I miss this? How much did these people eat daily before their 30 day fasting experiment? Could this just be due to not over co

Where was the control group? Did I miss this? How much did these people eat daily before their 30 day fasting experiment? Could this just be due to not over consuming calories on the regular? Did they eat the same amount and same foods but instead confined to their new fasting times? There are so many variables that were changed in this study that it is hard to pinpoint that one of them is the true reason for their adaptation