Can thin people with high metabolisms experience the same health problems as overweight people if they eat unhealthy foods?
Often, yes. Obese people can have more illness', but on a whole
yes, either obese or thin people can have the same diseases.
Example: An obese person could have heart problems due to the extra
weight carried around and lack of exercise (getting the heart rate
down) but a thin person that doesn't eat well or could be Anorexic
could have heart failure as well. Yes, thin people with poor diets
can have terrible heart health and poorly regulated blood sugar,
they just don't eat as much as it takes for them to be fat. The
reason why being thin means you're MORE LIKELY to be healthy is
because thin people are willing to eat less, and eating less/being
hungry is better for regulating cholesterol and blood sugar, and
can also help stabilize the immune system. That is, thin people can
"get away with" more sometimes.