A subversive solution
An alternative to save money and increase your metabolism is in your home.
Research shows that if you reduce the radiator thermostat, consumption is reduced, while at the same time brown fat is activated in the body and burns are increased.
Brown fat burns calories instead of storing them. To activate it you can take a cold shower, eat spicy food or just turn down the radiator thermostat.
Brown fat is abundant in babies to help them maintain a normal body temperature, but scientists thought it was disappearing as they got older. However, they found that it is retained in adults - in small quantities and not in all.
What makes brown fat interesting is its ability to directly burn food in order to produce heat, although usually the energy that the body receives from food is first stored and then released during physical activity, such as the exercise.