Big date tonight? Wedding this weekend? Family photos, the office holiday party, a 4th of July cookout in a fitted sundress? You want a flatter stomach today, not three months and one strict diet from now. Totally fair. And despite what a lot of brands promise, there are real fixes that kick in within minutes.
Below are 7 tricks that actually work to make your tummy look visibly flatter by the end of the day: how you stand, what you ate over the last 24 hours, a simple breathing exercise and, when you need results right now, seamless shapewear.
First: why your stomach looks bigger than it really is
Before flattening anything, it helps to know what you're dealing with. Most of the time, that rounder look isn't fat at all. It usually comes down to one of three things:
- Water retention. A salty dinner, a short night, your cycle: your body hangs on to water and your waist can temporarily measure about half an inch to an inch more.
- Bloating. Foods that ferment in your gut, eating too fast, barely chewing. Your digestive tract swells and pushes your belly forward.
- Slouching. Rounded shoulders, a tipped pelvis and a switched-off core can make your stomach look up to 30% bigger than it is.
The upside? All three are reversible, some in minutes, some in a few hours. Here's what to do.
7 ways to get a flatter stomach today
1. Drink more water (and skip the soda)
It sounds backward, but drinking water is how you stop holding on to water. When your body runs low, it stores fluid; keep it topped up and it lets go. Spread roughly 50 to 70 ounces (about 6 to 8 glasses) through the day. Pass on soda and sparkling drinks: carbonation plus sugar means twice the bloat.
2. Slow down and chew
Eat fast and you gulp air while skipping the first step of digestion, which starts with saliva. Two hours later, you're bloated. Set your fork down between bites and chew each one at least 20 times.
3. Cut the bloaters 24 hours ahead
Event tomorrow? Today, skip white bread, beans and lentils, cabbage, raw onion, soda, heavy dairy and gum (chewing makes you swallow air). Fill up on rice, lean fish, zucchini, cucumber and leafy green salads instead.
4. Sip an herbal tea after meals
Fennel, peppermint, ginger and anise help your stomach empty faster and cut down on fermentation. One cup about 30 minutes after eating is enough to keep post-meal bloating in check.
5. Stand tall
Lift your chest, roll your shoulders back and down, and tilt your pelvis slightly forward. Then engage your core by gently pulling your belly button toward your spine. That posture fix alone can make your stomach look about half an inch flatter, with nothing else at all.
6. Practice belly breathing
Deep abdominal breathing works your transverse abdominis, the deep muscle that holds your stomach in like a built-in corset. Lying down or standing, inhale and let your belly rise, then exhale and pull it in hard, as if your navel could touch your spine. Do 30 reps morning and night; you'll notice a difference within a few days.
7. Wear a tummy control bodysuit
For a specific event, this is the fastest fix there is. A good seamless tummy control bodysuit visibly flattens your stomach less than 10 seconds after you put it on, defines your waist and stays invisible under fitted clothes. It's the difference between feeling great in your outfit right now and working toward it for weeks.
The fastest fix of all: seamless shapewear
Every other trick takes time: a day for food, weeks for posture, months for your core. Shapewear is the only one that works instantly, which is exactly what you need when you're leaving in an hour.
Not all shapewear is created equal, though. Old-school rigid girdles squeeze hard, leave marks, slide around and get uncomfortable after a couple of hours. Modern seamless shapewear is the opposite:
- Circular-knit fabric that shapes without squeezing
- Zero seams digging into your skin
- Flat or laser-cut edges that disappear under clothes
- Comfortable for 14+ hours of wear
That's exactly what Elya's seamless pieces are made for: a stomach that looks instantly flatter and still feels comfortable, not one at the expense of the other.
Which shapewear hides a tummy best?
It depends on what you're wearing. Three solid options:
- Tummy Control Bodysuit: the all-rounder. One piece from bust to crotch, with moderate control you can wear for 14+ hours. Great for everyday looks like jeans, dresses and skirts.
- Firm Control Bodysuit: for a noticeable sculpting effect. Firm compression for nights out and big events when you want the results to show. Best for 4 to 8 hours.
- Tummy Control Panties: the low-key choice when you just want to smooth your lower belly. Wear them under anything, every day.
Every method, side by side
| Method | How fast it works | How long it lasts | Effort needed |
|---|---|---|---|
| Seamless shapewear | Instantly | As long as it's on | None |
| Eating smart the day before | 12–24 hrs | About a day | Low |
| Better posture | Instantly (the moment you stand tall) | As long as you hold it | Staying mindful |
| Belly breathing | 3–4 weeks | Long term | 10 min a day |
| Staying hydrated | 24–48 hrs | As long as you keep it up | Low |
| Core workouts | 4–8 weeks | Long term | 3–4 sessions a week |
| Dieting | Several months | Only if you stick with it | High |
Everyday habits for a flatter stomach
Want results that last? Stack a few of these:
- Drink about 50–70 oz of water a day
- Keep your core lightly engaged throughout the day
- Spend 10 minutes a day on belly breathing
- Go easy on bloating foods before big events
- Save shapewear for the moments you need an instant result
Skip the crash diets. They set off the yo-yo effect, slow your metabolism, and the belly comes right back (often bigger) once you stop.
When to talk to your doctor
If you feel bloated after almost every meal, if it hurts, or if you have ongoing digestive issues, check in with your doctor or a gastroenterologist. It could be a food intolerance (gluten, lactose, FODMAPs), irritable bowel syndrome or a gut imbalance, and no workout or shapewear can fix that.
The bottom line
For a flat stomach right now, seamless shapewear is the fastest, most effective fix. Pair it with good posture, smart food choices the day before a big event and belly breathing over time, and you get both: an instant visible difference and a firmer-looking shape that lasts.
Browse our shapewear bodysuits and our tummy control panties: seamless, made in Portugal and built for 14 hours of comfort.
5 foods to skip the day before a big event
Some foods cause bloating within hours, even if your digestion is usually fine. Skipping them the day before an event where you want a flat tummy makes a real, visible difference.
1. Cruciferous veggies (broccoli, cabbage, cauliflower, Brussels sprouts)
Super nutritious, but packed with fermentable fiber that turns into gas in your gut. Push them to the day after.
2. Beans and legumes (lentils, chickpeas, black beans)
Same effect as cruciferous veggies, only stronger. That means no hummus, falafel or chickpea salad the night before.
3. Fizzy drinks (sparkling water, soda, beer)
The carbon dioxide you swallow stays in your stomach and gut for hours. Stick with still water or herbal tea.
4. Gum and sugar-free candy
Sugar alcohols like sorbitol, mannitol and xylitol cause bloating and stomach discomfort for lots of people. Avoid them the day before and the day of.
5. Lots of dairy (yogurt, cheese, cream)
Even a mild lactose sensitivity can visibly puff up your stomach after a big serving. Go lactose-free or skip dairy for 24 hours beforehand.
How sleep and stress affect your stomach
Nobody talks much about sleep when it comes to a flat stomach, yet in the short term it's one of the biggest factors.
Short sleep spikes cortisol
Cortisol, your stress hormone, promotes fat storage around the belly and makes you retain more water. Getting 6 hours instead of 8 for just one night can make your stomach look noticeably bigger the next day.
A full night's sleep shows the next morning
Before a big day, go to bed early the night before and get at least 8 hours. After shapewear, it's the most effective natural strategy. Add good hydration and skip the 5 foods above, and you'll see the difference as soon as you wake up.
Ongoing stress holds on to belly fat
Over time, constant stress (a demanding job, regularly short nights) keeps fat parked around your midsection, an old survival reflex. Meditation, yoga and regular gentle movement are the only real long-term answers.
5 mistakes to avoid the night before
- Skipping dinner to "empty out" your stomach. It backfires: your stomach makes more acid, you overeat the next morning and you end up bloated. Eat light, but do eat.
- Chugging water right before the event to "flush things out." If anything, your stomach expands. Drink normally all day and stop 1–2 hours before.
- Trying brand-new shapewear the day before. You risk discomfort, the wrong size or marks. Test it at least 5 days ahead.
- Taking a laxative. It's genuinely risky for your digestion and often brings on cramps and discomfort on the big day. No health professional recommends it.
- Doing a hard workout the day before. Soreness, inflammation and the water retention that follows will puff up your stomach. Keep it gentle: yoga or a walk.
The right shapewear for every kind of day
What you should wear depends on when your event is and how long it lasts. Here's how to pick.
Morning photo shoot (1–3 hours)
Go for a Firm Control Bodysuit with extra compression. It's short but intense, so you get maximum sculpting for the camera.
All day at the office (8–10 hours)
Put comfort ahead of compression. The classic Tummy Control Bodysuit or High Waisted Shapewear Panties can be worn for hours without discomfort, with gentle compression that holds your tummy in all day without getting in your way.
Wedding or 12–14 hour celebration
The winning combo: a firm control bodysuit (strong control, totally invisible) plus Mid-Thigh Tummy Control Shorts to prevent chub rub on the dance floor. Maximum comfort, all night long.
Quick night out (3–5 hours)
Firm Control Briefs with firm compression: a sculpting effect you can see right away, comfortable whether you're standing or sitting, for an evening that wraps up within 5 hours.
Keep reading
Want to dig deeper into shapewear and find the right pieces for you? Two in-depth comparisons:
- Best Shapewear Bodysuits of 2026: our top 5: our picks for the most effective seamless bodysuits (thong, backless, strapless, seamless), with how we chose them and a side-by-side table.
- Best Tummy Control Underwear of 2026: the full comparison: a deep dive into shaping panties (mid-rise, high-waisted, firm control, seamless), with picks by body shape and outfit.
Both guides go further into the shapewear options covered here, with a practical focus on which style works best for what.