Flexible Economy is a new enhanced Economy service operating on a single cabin aircraft for customers on our shorthaul network flying to and from London Heathrow.
Although caffeine is generally safe and well tolerated, it can cause side effects when ingested in large doses. Additionally, regular caffeine use can cause dependency, resulting in withdrawal symptoms when caffeine is not consumed. Headaches can be a symptom of either too much caffeine or too little.
You can have too much of a good thing! With too much caffeine you could start experiencing some side effects like increased heartbeat, anxiety, nausea, insomnia and dizziness. Keep track of the caffeine your are consuming and cut back if you need to.