How do you think they chose to measure height from the bottom of the feet to the top of the head?
Hmm probably based on the fact that they want to measure the entire height of your body when you're standing, not including anything like hats, shoes, or hair.
Chronic malnutrition can affect adult stature. How do you think we can solve these medical issues?
Well where is this malnutrition prevalent? I think a widespread reform and improvement on making nutritious food more available and pursued would certainly help.
Do you think the genetic profile I-M170 can be adapted to make women toller?
I think that it is possible but not anytime soon. That will probably be more likely in the next ten to twenty years or so.
Height is a key indicator of good nutrition, does this mean that countries with smaller heights are genetically less healthy?
Much of it is probably just coincidence or even genetics, but I think that large disparities in height between two countries can certainly mean that the on average taller country is likely healthier. 
Do you think that medicals conditions such as dwarfism or gigantism are indicators of poor health?
I don't believe so, I think they are often random genetic mutations or other issues like that.