[tjogin]

No, having muscle doesn't make you overweight, no matter how much of it you have. The word overweight means to have excess fat, specifically.

Im not sure what you mean by under eating, but eating fewer calories than you spend is the only way to lose fat, other than surgery.

[vilmosi]

>>> The word overweight means to have excess fat, specifically.

Dictionary definition "above a weight considered normal or desirable."

The WHO definition "a BMI greater than or equal to 25 is overweight"

Not sure what definition you use, most gym-heads are technically overweight.

But discussing semantics is not the topic here.

[tjogin]

Not being able to understand the difference between excess muscle and fat is not semantics.

BMI is a tool applied to populations, used on individuals it can be very inaccurate, which is why nobody does it outside of blogs and magazines.