Upon moving to San Diego just over a year ago I was surprised at how many people were into work early so that they could be out enjoying Mother Nature in the afternoon. Being an exercise enthusiast from the North East I’ve had a blast either running 8+ miles around La Jolla cove, hopping on my bike for 40+ miles, or even the dreaded JCC Master’s swims led by full time masochists Chad, Nikee, and Rachel. The combination of any of these workouts and the preceding workday resulted in both physical and mental exhaustion, not to mention quite an appetite, which may explain why some people don’t lose as muc weight as they expect on an exercise program. And, if anyone out there has attended one of the San Diego Triathlon Club Aquathons you can attest to the caloric explosion that can occur after 30 – 50 minutes of lung burning activity followed by one of the finest post-race food spreads in the history of after-race parties.

However, a recent article in the New York Times about the timing of meals made me re-think my typical post-workout feed bag routine.

The New York Time article “Late Night Eating Linked to Weight Gain” comments on a medical study performed at Northwestern University and will be published in the peer reviewed journal Obesity next month. Researchers at the university found that mice whose feeding was restricted to daylight hours (the equivalent of our night time for our squeeky, furry, nocturnal friends) gained 28% more weight than the group that ate during their regular feeding times during the night as they instinctively do.

At first thought, you would think that the obvious reason for the weight gain in the first group of mice was because they ate more calories. Guess what? You’d be wrong! The researchers found that both groups consumed nearly equal number of calories and exercised for similar duration on each day, making the only difference between the groups the meal timing.

Now, granted this is an animal study and the results should not be immediately directed towards humans but it does give some guidance to those athletes looking to shed a few pounds.

I’m not suggesting that we all eliminate eating after our evening workouts, since re-fueling is an important part of proper recovery after a hard workout. Getting the correct amounts of protein and carbohydrates within 30 to 60 minutes after a workout (known as the glycogen window) is proven to increase muscle glycogen storage and provides a larger energy source for your next workout. However, for most of us the total calories that needs to be consumed for this effect is only around 500 calories – that maybe 2 bagels, or a turkey sandwich with a side of veggies.

I’m sure that on a semi-regular basis I approach the 1500 calorie range with my post-work meal, especially after a long workout. I have to admit, that previously I had been under the impression that in order to reduce weight, calories in had to be less than calories out. However, this new research may suggest that simply changing the time of day when these calories are consumed could help to reduce excess weight. I am even more convinced of these findings after thinking of previous research that has shown lower body weights for those individuals who ate breakfast every morning when compared to those that routinely skipped breakfast. I am sure that I’m not the only one who has over-eaten after an evening workout to the degree where breakfast isn’t even appetizing.

So once again, I’m not saying that we should stop eating when the sun goes down (we’re athletes, we need to eat). I’m saying that for the majority of us who aren’t training 30 hrs a week like the pros with a body fat percentage hovering around 6% it might be a good idea to re-distribute some of the calories. Instead of gorging yourself at the all you can eat buffet after beating yourself up with 10 x 400m with a 1 mile warm up and cool down on the track, save some of those calories for breakfast the next morning.

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Evan Johnson is a San Diego personal trainer with a Master’s Degree in Exercise Science. If you’d like a fitness consultation with Evan, give us a call at 858-678-0300