(HealthDay News) — Millions of Americans rely on caffeine for a morning or afternoon energy boost.

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However, relying too much on caffeine can cause unpleasant side effects such as migraines, stomach aches and irritability, says Mayo Clinic.

Signs you should curb caffeine use are:

  • You drink more than four cups per day.
  • You’re losing sleep.
  • You’re taking medication.

A safe amount of caffeine is usually under 400 milligrams per day, or less than four cups of coffee, Mayo says.

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