I believe your metabolism responds differently. The sugar signals your body that you've eaten a rich calorie source but fat is lacking, please save this as fat

I believe your metabolism responds differently. The sugar signals your body that you've eaten a rich calorie source but fat is lacking, please save this as fat for later. If you had eaten a meal with more fiber and fat, it signals to your body that fatty meals are available now, you can use some for energy, no need to create more storage.