2. You’re dehydrated.
One of the cheapest – and best – ways to give your metabolism a boost is to drink plenty of water, especially first thing in the morning. This helps kick-start your metabolism for the day and flush out toxins from your body. Not enough water and too much caffeine in the morning can actually cause your metabolism to become sluggish throughout the day (2). For even better results, start your day with a glass of lukewarm lemon water.