[sonofjanoh]

Interesting how physical activity is not showing up in any of these so called experiments. Why is this trend to outsmart the body? Give it a bit of work and you'll have a balance and energy that no wii fit and alarm clock can asses. No gadget nor habit can outperform a few push-ups with an intense workout or an energetic soccer game. Your body will tell you when it's time to sleep and when it's time to eat and believe me it will correlate with your working day.

Mens sana in corpore sano.

[liquidben]

First, the article never explicitly states that the author didn't try exercise.

Second, getting up and exercising is a complementary behavior to changing your eating habits. Neither negates the other and both together are best.

With luck, the author will feel more energetic after the diet change, and will then be motivated to start an exercise program. (or just nail the early donut, shrugs)

[jlees]

I do exercise, but not as much as I'd like to. Half the trouble is finding time in a busy day when I still think of myself as horribly unfit (I recently lost 70 pounds and am a lot fitter than I used to be!).

One of the first things I tried to get my body clock sorted out was morning gym sessions, but I just couldn't afford the time or subscription cost.

[yef]

Try morning jogs outside. Start slow. It does wonders for my energy level and clarity of thought for the rest of the day.

[sorbits]

I’ve had a problem getting up early for as long as I can remember.

Physical work does not work for me. What finally did the trick was sunlight. I moved (a year ago) to a new place which has panorama windows in all the rooms and facing ocean/sky — since then my sleeping schedule has been normal except December/January (I’m in Scandinavia, so we have dark winters).

For scientific explanation see: http://en.wikipedia.org/wiki/Melatonin