If you have struggled to lose weight through diet and exercise but are not ready for surgery, a gastric balloon may have come up. Here is what it actually is, in plain language.
The basic idea
A gastric balloon is a soft silicone balloon placed inside your stomach and filled with sterile fluid. It occupies space, so you feel full sooner and eat less at each meal. Nothing is cut, stapled or permanently altered.
It is a temporary device. When the period ends the balloon is removed or passes naturally, and your stomach returns to how it was.
How it changes eating
Two things happen. The obvious one is mechanical — less room means smaller portions before you feel full. The less obvious one is that a filled stomach slows how quickly food leaves it, so that fullness lasts longer between meals.
What a balloon does not do is change why you eat. It restricts capacity; it does not address stress eating, habit or boredom. That is why dietary support during the balloon period matters so much.
Two ways to place one
With gastroscopy: the balloon is placed and later removed endoscopically under light sedation. In place for 6 or 12 months.
Without gastroscopy: the Allurion swallowable balloon is taken as a capsule while you are awake, stays about 16 weeks, then empties itself and passes naturally — no removal procedure.
Who tends to consider it
Adults with a BMI between 27 and 40 who have not achieved lasting results through lifestyle changes alone. It is also used as a bridge for higher-BMI patients ahead of later surgery.
What results look like
Published studies report average weight loss of roughly 10–15% of total body weight over the balloon period. That is a population average, not a promise — individual results vary considerably, and the biggest variable is what you do during those months.
The honest limitation
Weight regain after removal is common if eating habits have not genuinely changed. A balloon buys you a window in which eating less is far easier than usual. Whether that window is used well determines the outcome.