Drinking pineapple juice daily can be fine in moderation, but too much may raise your sugar intake, irritate your stomach, and wear down tooth enamel. It may also help with vitamin C intake, hydration, and digestion because pineapple contains bromelain and other nutrients.

What it may help with

  • Immune support, mainly from vitamin C.
  • Digestion, because bromelain can help break down protein.
  • Inflammation and swelling, though the evidence is not strong enough to treat health problems on its own.

Possible downsides

  • More sugar and calories than whole fruit, which can affect blood sugar and weight if you drink a lot.
  • Heartburn, nausea, diarrhea, or stomach irritation, especially if you have acid reflux or drink it on an empty stomach.
  • Tooth enamel damage over time because it is acidic and sugary.
  • Allergic reactions are possible in some people.

Practical amount

A common moderate amount is about 8 to 12 ounces a day, ideally unsweetened and taken with food rather than as a replacement for whole fruit.

When to be careful

Be extra cautious if you have diabetes, reflux, kidney disease, a pineapple allergy, or you take blood-thinning medication.

TL;DR: daily pineapple juice is usually okay in small amounts, but whole pineapple is generally better than juice because it has more fiber and less sugar concentration.