You wake up in the morning, put on your jeans, and they fit perfectly.
Then dinner rolls around and suddenly that same waistband feels two sizes too small.
Sound familiar?
Here's the good news: A stomach that looks noticeably bigger at night doesn't necessarily mean you've gained fat.
Bloating can cause your abdomen to feel swollen, tight or uncomfortable — and what you eat throughout the day can play a major role.
Some foods produce more gas during digestion. Others can contribute to water retention. And certain foods that are perfectly healthy for one person can leave another feeling uncomfortably bloated.
If you're regularly reaching for the stretchy pants by dinner, take a closer look at these eight common culprits.
1. Beans
Beans are nutritional powerhouses packed with fiber, plant protein, vitamins and minerals.
Unfortunately, they're also famous for producing gas.
Beans contain certain carbohydrates that aren't completely digested in the small intestine. When they reach the large intestine, your gut bacteria ferment them.
One of the byproducts of that fermentation? Gas.
That doesn't mean you should eliminate beans. Starting with smaller portions, gradually increasing your fiber intake and thoroughly rinsing canned beans may make them easier to tolerate.
2. Broccoli, Cauliflower and Brussels Sprouts
Here's another case where an extremely healthy food can have an uncomfortable side effect.
Cruciferous vegetables such as broccoli, cauliflower, cabbage and Brussels sprouts contain plenty of fiber and beneficial nutrients.
But they also contain fermentable carbohydrates that can increase gas production in some people.
If a giant raw broccoli salad leaves you feeling like you've swallowed a balloon, try eating a smaller serving or cooking your vegetables instead.
You may find them considerably easier to digest.
3. Salty Processed Foods
Sometimes the culprit behind a puffy stomach isn't gas at all.
It's fluid.
A high-sodium meal can cause your body to temporarily retain additional water. Restaurant meals, deli meats, frozen dinners, canned soups, chips, sauces and other processed foods can contain surprisingly large amounts of sodium.
That's one reason you might wake up feeling especially puffy after a salty dinner the night before.
Watch the sodium on packaged foods and pay attention to how your body responds after particularly salty meals.
4. Sugar-Free Gum and Candy
This one catches a lot of people by surprise.
Many "sugar-free" products contain sugar alcohols such as sorbitol, mannitol and xylitol.
These sweeteners aren't always completely absorbed by the digestive tract and can cause gas, bloating or diarrhea in some people.
There's another potential problem with chewing gum: You may swallow extra air while chewing it.
If you're constantly bloated and regularly use sugar-free gum, mints or candies, check the ingredient label.
Your supposedly innocent afternoon habit could be contributing to the problem.
5. Milk and Ice Cream
Have you noticed that ice cream tastes wonderful going down but your stomach isn't quite as happy an hour later?
Lactose could be the reason.
People with lactose intolerance don't produce enough lactase, the enzyme needed to properly digest lactose, the natural sugar found in dairy products.
Undigested lactose can then travel into the colon, where bacteria ferment it and produce gas.
Symptoms can include bloating, gas, abdominal discomfort and diarrhea.
And lactose tolerance can vary considerably from person to person.
If dairy consistently leaves you uncomfortable, it's worth paying attention to the pattern rather than assuming bloating is simply something you have to live with.
6. Carbonated Drinks
Those bubbles have to go somewhere.
Soda, sparkling water and other carbonated beverages contain carbon dioxide gas. Drinking them can introduce additional gas into your digestive system, which may temporarily make your stomach feel fuller or more distended.
Try replacing your usual carbonated drink with still water for several days and see whether you notice a difference.
Sometimes the simplest experiment tells you a lot.
7. Onions and Garlic
Onions and garlic add tremendous flavor to food and contain beneficial plant compounds.
But for certain people, they can also be major bloating triggers.
Both contain fructans, a type of fermentable carbohydrate that can be poorly absorbed by some people's digestive systems.
If onions or garlic consistently leave you feeling uncomfortable, try reducing the amount you eat and see if your symptoms improve.
There's no reason to automatically eliminate them if they don't bother you.
The important thing is discovering your triggers.
8. A Huge Dinner
Okay, this isn't technically one food.
But it may be one of the most overlooked causes of that "8 p.m. belly."
Eating a large meal — particularly after eating relatively little earlier in the day — physically puts more food into your digestive tract at once.
Add a salty entrée, carbonated drink, dessert and a few gas-producing ingredients, and suddenly the stomach that looked flat that morning can feel dramatically different.
Try eating more slowly and stopping when you're comfortably satisfied rather than stuffed.
You may be surprised by the difference.
Why Am I Flat In The Morning But Bloated At Night?
Your digestive system isn't static.
Throughout the day, you eat, drink, digest food, produce gas and pass stool. Fluid balance can change as well.
So some difference between your morning and evening stomach is completely normal.
But if you regularly experience significant bloating, constipation or uncomfortable fullness by the end of the day, it's worth looking for patterns.
For a week, jot down what you eat and when the bloating begins.
You might discover that one or two foods consistently appear before your worst evenings.
And don't overlook your bathroom habits.
Constipation can contribute to abdominal bloating and discomfort, particularly when you're not having regular bowel movements.
If bloating is persistent, severe, suddenly different from usual, or accompanied by symptoms such as significant abdominal pain, vomiting, blood in your stool or unexplained weight loss, talk with a healthcare professional rather than assuming food is the cause.
You don't necessarily need a complicated diet to figure out what's making you bloated.
Start by paying attention.
Notice which foods make you feel good — and which ones leave you loosening your waistband a few hours later.
Your evening belly may be telling you more about what happened in your digestive system that day than what's happening on the bathroom scale.
