Lori, sweetie, you're preaching to the choir here. I would suspect that most of us on this board are familiar with those facts, so just parroting them back to us doesn't do anything to convince us.
On the other hand, please respect that many of us (Jay and myself included) have lost significants amount of weight and have maintained that loss for a while and therefore we know how different it is to put those facts into practice, and how everyone's body is different.
Yes, it's true that 3500 cals = 1 lbs of fat. Yes it's true that if you increase your daily activity in *any* way, in combination with diet, that you will lose weight.
But the human body is not a computer or a calculator. And there are a lot of things other than just calories in vs. calories out that effect weight loss.
And yes, it's good to know that the chores you do every day *can* help you lose weight. Certainly it's good to, say, vacuum the house vs. sitting like a lump on the sofa with your laptop (she says, doing exactly that).
Jay is correct that when you estimate your daily calories, most calculators take into account that people do regular things every day - get up, do dishes, sweep the floor, etc. So re-adding those items to your daily total can skew your count in a bad way.
Jay is also correct in her comment that burning calories isn't the ONLY purpose of exercise. There are benefits to getting a solid block of structured exercise in that simply doing more household chores isn't going to help you with. And eventually just adding in a round of dishwashing is NOT going to make a huge big difference in your weight loss.
The other thing that I'd like to point out is that a lot of people get tied up in the minutiae of calorie counting and try to justify everything they eat with everything they do - I washed the dishes 2x today, so I can eat another chocolate. Or I vacuumed the stairs, so I can have an extra T of peanut butter. And when you start to micromanage like that, most people wind up giving themselves too much credit. Because whose to say that how you wash dishes and how I wash dishes burns the same amount of calories. Perhaps you wash all of yours by hand and scrub the pots vigorously and I just rinse mine and put them into the dishwasher. Do you think that by doing that we burn the same amount of calories? Probably not.
Also someone who is fit and in shape is going to burn MORE calories doing the same activity than someone who is not - because muscles are more metabolically active than fat. So now, when you calculate that you washed dishes 2x today, are you making sure that you're calculating your calories based on your current fitness weight?
I do think that someone who does something that is not part of their normal routine - like shoveling snow or scrubbing a floor, or spending an hour cleaning the bathroom hard - should give themselves some calorie benefit there. But just washing dishes? Nah, I can't get behind that.
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