healthyfastrunner wrote:
Jim, I don't think that formula is correct.
If an average woman (non-runner) is 5'8 and 140, she needs 1540 calories to maintain that weight? It's more like 2500.
Additionally, if this runner is 130lbs and running 7 mpd, and she eats 2130 (with no other exercise) I think she's going to need more than that to maintain.
We don't know anything about her, or if she really is 10lbs overweight, and I don't think it's very likely either.
BTW I am 5'8 and 120lbs and I eat a lot more than those calories! I start at 2000. If it's a 50 m week, I add on 5000/7 cals each day. Which is similar to your formula in that respect (100 cals for each mile).
healthyfastrunner,
Trust me, the formula is correct within a varying error to apply to different people who have slightly different metabolisms. This DOES NOT apply for people who have a thyroid condition or some other condition which affects metabolism.
Some things for you:
1) If you are a MAN, your weight x 12 = 1440 which is only 560 shy of the 2000 you say you start with each day. The 1440 would maintain your weight if you were SEDENTARY. If you ever walk around anywhere or do any physical activity other than your running you could easily get up to 2000 calories a day to maintain your weight.
2) Let's say you are in a 50 mile week (50x100/7=714). So, you get to eat 714 calories extra each day. Perhaps you don't eat those extra calories. Many times people have an idea of how much food they should eat in one sitting, or their body tells them they are full, regardless of how many miles you are running. It is very possible that you aren't eating those 714 calories extra each day when you run 50 miles a week.
3) Unless you are strict with pulling out the calculator, it has been my experience that people don't really realize how many calories they are eating. I have a buddy who is 6'1" and he weighs 140 (he's not a runner) and he is very thin. He often talks about how he eats like a pig but can't put on weight. I work with him, and I see what he eats - a banana or some raisins for breakfast with black coffee. A banana is only 125 calories, and a big box of raisins is 130 calories. Then for lunch he'll have a Lean Cuisine meal that ranges from 350-450 calories. He'll get a candy bar in the afternoon (240 calories or so), so he's now up to 820 calories on the days he eats the most caloric stuff. He can now eat 860 calories for dinner to maintain his weight if he were just a sedentary person, but he fences and does martial arts three days a week, plus he lifts weights and uses an Orbitrek. He has NO IDEA what eating like a pig is. In my former obese days, it was not uncommon for me to eat three large fast food hamburgers (with cheese of course) for lunch. I've had many a meal where I had two Big Macs and a quarter pounder with cheese. That's almost 2000 calories right there. THAT was eating like a pig.
4) Finally, getting down to using formulas is only necessary for those who have tried to lose weight by doing other things and were unsuccessful. If you are able to maintain your desired weight doing the things you do, then consider yourself fortunate - you don't have the burden that some people do (granted for most of those people that burden is self inflicted). If you ever find yourself needing to lose 5 pounds, 10 pounds, whatever and it seems that running more and eating less isn't doing it for you, break out the calculator and have a go at it.
NOTE - Initially (in the first week or so) most people will lose more weight than just 1 pound even with just a 500 calorie deficit because they will lose excess stored water as a result of cutting both carbs and sodium. After this initial water weight loss, the forumla for 500 calories deficit per day is right on with regard to a pound a week loss.