Why trying to ‘burn off’ food is a waste of time
On 30 Dec I tweeted: “All these people ‘walking off’ indulgence make me laugh – I’d have to walk to Bristol & back (54 miles) to counter a Duchy Xmas pudding!” “Oh & that doesn’t deduct the BMR calories I would have used anyway so make that to Bath and back!”
Here’s the maths!
One fairly small (5 inch diameter) Duchy Original Christmas pudding contains 2,839 calories (313 per 100g)
We live 27 miles from Bristol. This site tells me that a 110lb person would use up 1,482 calories in 9 hours walking 27 miles at 3 miles per hour. Hence I have to walk there and back to ‘use up’ over 2,800 calories.
However – and this is something I only realised writing this blog that all calories burned calculators include the Basal Metabolic Rate. Hence, I would need to allow for what I would have been doing had I not been walking to Bristol and deduct this – because, by walking, I have only burned additional calories. If I had been writing for 9 hours instead, I would have used 808 calories, so, walking to Bristol would use 2,000 calories.
Just as well that none of this calorie stuff amounts to very much. If you want to be fit – be active; if you want to be slim – don’t eat Christmas Pudding!