I am 6 feet 6 inches tall and weight 140 lbs. I am not concerned about being fat or have any of the symptoms of anexoria, but have lost nearly 20 pound in the last 2 months, around 15% of my total weight, it is because I get nausious when I try to eat. At what weight should I be concerned that I am too thin?

We need to know if you're a man or a woman as well as your age.

Here's a site which allows you to check for your ideal weight - Height and Weight Chart - height weight chart, weight height chart

I am a male age 35.

Did you look at the chart that I posted?

Yes but the chart only goes to 6'4". At that height I am 22 lbs underweight for my narrow frame.

Also according to the chart, I am medium framed, not skeletal as I thought.

Any ideas?

No. I would trust the chart.

The chart doesn't go to my height. So it offers no answers, how can I trust that?

I don't mean to sound short, but it didn't seem like the reply that was given was very helpful.

So go to the closest height. I can't possibly tell if you are too thin or too fat or anything in between based on your height and weight. You look in the mirror. What do you think? I don't know what you want me to say.