Not only is everyone's idea of "health" or "healthy" different, but *needs* in order to obtain "health" are different.

I too have friends that eat a fast food-type diet but pop vitamins like candy.
I would have a problem with getting all I, in particular, need from a healthy diet (which I have) because I would have to eat a lot in quantity to get what I need which means more kcals, more time eating, etc.
I don't eat dairy (save for some ghee now and then) because I don't like how I feel much less how it *might* affect my skin so I'd have to consume a TON of green, leafy veggies, etc to get all my Vit D and layout in the sun. Plus there's one's tastes and preferences. Some people don't like beer. Some people don't like fruit.
I'm sure everyone can come up with an example of a particular lifestyle that is working for one, and not working for someone else.
I have friends that eat like monks and are runners but genetically have scary, high cholesterol. (Which is found in blood testing.)
I TOTALLY believe in getting your blood checked -& on a yearly basis, if possible. For all the reasons mentioned above PLUS getting an endocrine/hormonal panel. This too can be a factor in your skin (high or low sex hormones) not to mention overall health!
But (trust me) if you don't have a super doc in the US, you'll probably have to do your research ahead of time and ask for what you want tested. If your met with resistance (i.e., my ex-doc:
"Why in hell do you want this?" "Are you going to ask me every year for this?!") go elsewhere.

And no, your lab will most likely NOT send you the results. You'll have to go back to your doc for this and they'll tell you, "
looks fine!" unless there's something glaringly deficient. [The print copy has the norm values next to your value.] ASK FOR A COPY FOR YOUR RECORDS.
There's more I could add to my story about this but this isn't the place
