Think lemon water is healthy? A Harvard-trained doctor reveals what most people get wrong

Lemon water has built a near-mythical status in wellness circles — from detox claims to digestion miracles. But how much of that is actually true? Harvard-trained gastroenterologist Dr. Saurabh Sethi recently took to Instagram to clear up the hype, and his insights might make you rethink your morning routine. While lemon water does come with real gut-friendly benefits, it’s not for everyone — and overdoing it can cause more harm than good.

Lemon water boosts hydration

For starters, Dr. Sethi says lemon water gives hydration a much-needed boost. With around 75% of adults living in a state of chronic dehydration, adding a splash of lemon makes water more appealing — which means better digestion, sharper focus, and more energy. Bonus: one lemon gives you around 35mg of vitamin C, or 40% of your daily needs, helping with immunity, collagen, skin health, and iron absorption.

May improve digestion

On the digestive front, it may help people with low stomach acid. The mild acidity of lemon can stimulate gastric juices and bile flow, which some say improves digestion before meals. Warm lemon water also feels soothing, but there's a catch — vitamin C breaks down at high temperatures. Dr. Sethi recommends letting hot water cool a bit before adding lemon, so you don’t lose the benefits.

Look out for acid reflux

But it’s not all upside. Dr. Sethi warns that lemon water can backfire for those with acid reflux or GERD. Up to 20% of people with reflux symptoms report worsened burning or bloating after citrus intake — especially on an empty stomach. If that sounds familiar, it might be time to cut back.

Can affect your teeth

Another concern? Your teeth. Lemon juice has a pH of about 2, making it very acidic. Frequent sipping can wear down enamel over time. To protect your teeth, Dr. Sethi advises drinking lemon water in one go instead of sipping it all day, using a straw, and rinsing your mouth with plain water afterwards.

Does it detoxify the body?

Perhaps most importantly, Dr. Sethi busts one of the internet’s most popular myths: lemon water does not detox your body. “Your liver and kidneys do that,” he says. What lemon water really supports is hydration and digestion — not some magic cleanse.

In the end, he calls lemon water a potentially great gut-friendly habit if it suits your body. The key is being mindful of your own digestion, reflux triggers, and dental health