Your health is written in your hands

Do you drink too much coffee?

How much caffeine we can tolerate varies from person to person. Cold, clammy palms could mean you're having too much. ‘Clamminess is a sign that your body's in a nervous state - and caffeine aggravates that,' says Simon. Hot, sweaty palms are a classic sign of an overactive thyroid, which sends the metabolism into overdrive.