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Even mild dehydration can make you feel tired, headachy and unable to concentrate, which isn’t good for your productivity or your well-being.

Sheryl Denzer, 67, said she has spent the week feeling headachy and heartbroken.

Whatever the reason, the Philharmonic’s clenched, loud performance of Beethoven’s Piano Concerto No. 4 last week left me jangled and headachy.

I was weak, having trouble breathing, headachy – it felt like a case of the flu, and not a light one.

But if you ignore your body’s early hunger cues — perhaps because you’re busy, or simply don’t trust that you need to eat — or if those cues have gone silent from years of denying them, you may become dizzy, lightheaded, headachy, irritable or unable to focus or concentrate.