Re:cardio and no strength training as you lose weight
Putting diet aside, and the possibility that the person is consuming more calories....consider exercise assuming consumption remains constant........
What I've read, and what I've observed in myself is that when I strength train, is it does effect my weight...my weight goes up (temporarily) after a strength training session. But it does not slow my weight loss overall. After a challenging workout my body sends extra fluid and compound to the muscle to make them stronger and more able what was asked of them. We often work our muscles differently from day to day...such as a split routine. So just when the muscle are ready to release the extra fluid, we go and work another set, and that set of muscle holds extra water. Miss a few weight training workouts altogher, and the muscle shed the extra fluids.
But we are decidated exercisers.....we stick it out long enough to weather the little blips and variations in our weight, and try not to let it bother or deter us. But think about how many people are not experianced or decidated, how many people start an exercise program but never stick with it longer than a week or so. I"m betting that there more people that start training and give it up quickly, than those that are consistent. They start to add weight training, see the little extra fluid weight gain and go OMG, I'm gaining weight, and they quit. They don't stick with it long enough to realize that it is a normal part of getting fit and that if they stick with it and look their results over a longer period of time, they lose just as fast, faster even. And thus weight training and weight gain becomes one of those misconceptions, and urban legend.
My own exeriance is that when I choose just walking for exercise, I don't get the little ups and down, my weight is more even. Of course, I know that working my body in a variety of ways, even if it builds muscle, especially if it builds muscle, is good.