You can now set up a task on zenobase.com to get the total number of calories consumed from Fitbit, as well as individual meals from Jawbone UP.
The data from Jawbone UP is particularly interesting, as it includes a timestamp for each meal, so you can check not just how much you eat, but also if when you eat makes a difference!
Are there any other services that we should consider? Are you running an experiment where you need to track not just calories, but also specific nutrients like protein and fat? Let us know!
Update: You can now also get calories consumed stats via Google Fit, if you are using an app like Lifesum.