Low partial pressure of oxygen in tissues is a condition called
Ketogenic diet (keto diet).
It’s a low-carb, high-fat diet which encourages the body to burn fats instead of carbohydrates.
It might not work if you don’t get the food proportions right. The person may not cut enough carbs out of their diet (they won’t lose weight).
It also doesn’t work for everyone (There is some explanation behind it but I don’t know it, sorry. However, you could say that just like other diets, it just doesn’t work for some people and their metabolism).
The answer is C) GPS fitness monitors
GPS monitors track your location over time, which is a better way of measuring distance traveled than a device that measures the number of footsteps you've taken.
Answer:
I would say early twenties to mid-thirties because they are quite polite and don't ask too many questions.