I saw this on a dan John forum for fat loss.
Was this Dan's recommendation, or just something folks were talking about on there? (I think I saw
@Dan John post a few days ago, maybe he'll come back and clarify.)
At first glance 10 miles a day would be quite time intensive. Would this kind of mileage be a negative on joints, tendons and ligaments?
At what point with daily mileage might you reach diminishing returns? My guess would be about 6.
Steps in kitchen, etc not included. Talking programmed walking.
For several years I walked to/from work, and on some days it was to work, to daycare, to home. I got at least 6 miles a day, and that didn't count the walking that happened while working, or the hiking I did in my free time on the weekends. Weekly, I'd log 70ish miles of "purposeful" walking. I did not lose any weight, despite being a fairly blubbery 250-265lbs. I actually did start losing weight when I stopped walking - which coincided with changing training patterns due to two back-to-back injuries and changing eating patterns.
With that out of the way, talking about negative effects and diminishing returns... I think as usual it depends. A 60 year old with arthritic knees is going to quickly run into "issues." I personally find 8+ miles a day to be hard on my ... everything. My knees, my feet, my toes start aching more, and my hips and knees get tight. Chafing becomes an issue often. This is contrary to a lot of what I read, but it wears me down. Long walks are not "restorative" to me anymore than long runs are. Short walks (for me, I'd say under an hour) and leisurely walks can be quite enjoyable and relaxing. Other training I do also effects this. Rather than imagining a hypothetical person in a hypothetical situation, I think it is a lot simpler to simply titrate the walking up and down based on how you're feeling. This in particular allows one to slowly increase volume over time, allowing everything to adapt and grow.
My main problem with the idea of walking 6-10 miles a day is a simple matter of time. When I walked to/from work, that was an easy hour or so - each way. When I had to also walk to day care to pick up my son, that was an easy 30-45 minutes more. I understand some people can walk 4+ mph (I have a friend who claims he sets his treadmill to an incline and walks a 4.5 mph for 30 minutes!), but I'm more of a 3.5 mph when I am trying to go fast. This means we're talking a 2+ hr commitment - every day. This is a HUGE "barrier" to being active - if your goal is 2 hrs, but you only have time for 1 hr - or 30 minutes - you are much more likely to simply not go at all. For you personally this may be a non-factor - "oh of course I would have no problem with skipping days or only doing a mile or two!" - but as a general recommendation I just think it is steering a bit far, especially if the goal is simply weight (fat) loss. This is especially true for busy adults and parents (who are generally also busy adults).
If the goal is primarily fat loss, my first steps (aha ha) would be to assess where the person is currently in regards to lifestyle and diet, and then - with them - decide on a small addition we know we can make that will move them closer towards that goal. With the popularity of step trackers, daily steps might not be a bad thing to work on nudging up and may encourage someone to not only add in or increase purposeful activity, but to also increase their non-purposeful activity.