Health clubs that want to boost their members' workout results, without requiring too much extra physical effort, might want to think about incorporating crossword puzzles or sudoku into routines.
An hour of mental exercises, such as puzzles and quizzes, can burn up to 90 calories according to research website cannyminds.com. That's more calories than a chocolate chip cookie or a custard cream biscuit.
The researchers say that neurons in the brain use around 75 per cent of sugar glucose (available calories) from the blood to relay messages to the body via neurotransmitters.
