The great news is that Experiments do have the ability to impact your ratings - and your overall health of course!
Like all experiments there are side effects (these ones being positive) and any increase in exercise or sleep will definitely show up in your detailed graphs!
For those Experiments which are focused on diet, whilst you won't see your efforts in graph form, you will be able to see your results at the end of each challenge! And you'll be all the healthier for it!