# Thread: Any math wizards in here?

1. ## Any math wizards in here?

Is there any way I can take my current calorie intake and median weight loss to calculate my maintenance calories? So say that I lose 120 grams per day eating 2500 calories. Can I use those numbers to calculate my maintenance?

2. That's the mean, not (necessarily) median.

3. Originally Posted by air2fakie
That's the mean, not (necessarily) median.
Ok. Perhaps wrong term. Either way, can I use weight loss and calorie intake to calculate maintenance?

Ok. Perhaps wrong term. Either way, can I use weight loss and calorie intake to calculate maintenance?
yes. let's say you're eating 2000 calories and losing 2 kg per month (= 0.5 kg per week). 1 kg is 7000 calories, so 0.5 kg is 3500, right?

if you're losing 0.5 kg per week, that means you're in a 3500 calorie deficit over the week. there's seven days in a week (3500/7), so that means you're in a 500 calorie deficit each day. now, if you can determine you're in a 500 calorie deficit by eating 2000 calories per day, that means your maintenance is around 2500 calories

hope this helps

5. 120 grams lost per day is

0.12 * 7700 calories per day

because there is 7700 calories in 1kg of fat mass

This assumes your daily loss estimate is accurate. Ideally I would take at least 2 weeks of daily measurements to ascertain this. The regression slope (excel SLOPE() function) can tolerate noise better than a straight AVERAGE() does. It can also tolerate missing days - you supply both the date as the "x" column and your weight as the "y" column

6. Dont figure grams per day. You have fluctuations all day long. Take current weight and then in 3 weeks take that weight amount and figure from there.

7. You want your daily standard deviation of calories to be as close to 0 (zero) as possible. There are also 7000 grains in a pound.

You want your daily standard deviation of calories to be as close to 0 (zero) as possible. There are also 7000 grains in a pound.
The speed of light is 1.8 x 10^12 furlongs per fortnight

9. Originally Posted by SuffolkPunch
The speed of light is 1.8 x 10^12 furlongs per fortnight
Light exhibits properties of both particles and waves. Nothing else does.

Is there any way I can take my current calorie intake and median weight loss to calculate my maintenance calories? So say that I lose 120 grams per day eating 2500 calories. Can I use those numbers to calculate my maintenance?
Yes, but it will always be retrospective, so it will only serve as a guiding reference point for a period of time.

And, as you lose weight, the number will change.

Maintenance is a moving target... but yes, you can calculate an approximation.

Is there any way I can take my current calorie intake and median weight loss to calculate my maintenance calories? So say that I lose 120 grams per day eating 2500 calories. Can I use those numbers to calculate my maintenance?

No, because you don't know how many grams are from fat and how many are from muscle. Also, your body adapts. Eating more increases base metabolism some, and eating less reduces base metabolism some. All you can do is use an online calculator for most people with your specs to get you in the ball park and then from there go based on how you feel.

12. Originally Posted by Darkius
No, because you don't know how many grams are from fat and how many are from muscle. Also, your body adapts. Eating more increases base metabolism some, and eating less reduces base metabolism some. All you can do is use an online calculator for most people with your specs to get you in the ball park and then from there go based on how you feel.
I think it's better to estimate your maintenance from your own data instead of online calculators. Online calculators can be used as a starting point, but your own individual data will provide a better estimate. Also, not all online calculators are the same and you can get different estimates from different calculators as they probably vary a bit in their assumptions.

You are right that when you estimate maintenance from data obtained in a calorie deficit you will underestimate your maintenance because of metabolic adaptation (and systematic NEAT variation when going from deficit to energy balance). But you can factor this into your prediction to make it more accurate, for instance by adding 50 calories to the maintenance estimate suggested by a regression. Ultimately, the best way to assess the quality of the approximation is to observe what happens over a new data collection period when you actually switch to the assumed maintenance calorie level. I bet any approach based on own data is going to outperform online calculators in that respect.

13. Originally Posted by EiFit91
I think it's better to estimate your maintenance from your own data instead of online calculators. Online calculators can be used as a starting point, but your own individual data will provide a better estimate. Also, not all online calculators are the same and you can get different estimates from different calculators as they probably vary a bit in their assumptions.
This ^^^^^^. Real world data is certainly better than an esitmator based on factors that may have little to no bearing on "you".

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