You lose water through your skin, from respiration as you breathe out moisture and through functions such as pumping blood and running your internal organs.
As you may have guessed, "morning abs" are primarily due to dehydration (hence the whole hangover abs thing, too), explains Joel Martin, Ph. D., C.S.C.S., assistant professor of kinesiology at George Mason University.
Water retention causes swelling and puffiness in various parts of the body, including the face. This may give the illusion of excess facial fat.
Food Digests During the Night
Anything you eat will affect your physical weight and the shape of the digestive tract during the day. As your body processes food, it retains some water, develops gas and produces stool. These can all contribute to feelings of a bigger stomach and heavier body.
Is it true that we weigh less in the morning? Generally, yes, because you don't have the added weight of a recent undigested meal. During the day, when you're eating and drinking, those foods (and fluids) add weight—at least until they're digested and excreted.
The Best Time to Weigh In
You should step on the scale first thing in the morning. That's when you'll get your most accurate weight because your body has had the overnight hours to digest and process whatever you ate and drank the day before. And you should try to turn that step into a regular part of your routine.
Dr. Martin also pointed to the fact that, when you wake up, you haven't eaten for the last several hours, so your stomach isn't packed with heavy food. That's a major reason why you weigh a lot less in the morning than right before you went to bed.
Water Retention: One of the most common contributor to someone looking overweight is water retention. Too much salt, sedentary lifestyle, not drinking enough water can all cause water retention.
Those eight glasses of water per day can help your face look slimmer and speed your metabolism to shed overall fat from the body. So keep track of your water intake level. Also every time you feel thirsty, reach out for a glass of water to see if it is really hunger or just thirst.
A combination of physiological changes that happen while we sleep, our chosen sleep position, and various environmental factors can all cause our faces to look puffy, discolored, textured or simply different in the mornings.
Your Muscles are Retaining Water
Weight training exposes muscles to stress to strengthen them and the resulting soreness causes the surrounding tissues to swell until things calm down. “Extracellular water increases transiently in the muscle to relieve inflammation of the muscle soft-tissues,” Tamaki says.
under 18.5kg/m2 – you are considered underweight and possibly malnourished. 18.5 to 24.9kg/m2 – you are within a healthy weight range for young and middle-aged adults. 25.0 to 29.9kg/m2 – you are considered overweight. over 30kg/m2 – you are considered obese.
Your Slow Metabolism:
When you have a slow metabolism, your body doesn't convert food into energy in sufficient quantities. So most of the food you eat is stored in the form of fats. This is the main reason why some people get fat even though they don't eat much.
Yes, fat can get “jiggly” before or during weight loss — BUT, it's a good sign, and there are ways to prevent it or make it better.
Drink Plenty of Water
Whether you had a little too much alcohol or had a giant cheeseburger, drinking plenty of water can help you debloat overnight—or even faster, says Burgess. "Although it may sound counterproductive to drink more, water can actually help flush our system and reduce the puffiness."
The bulging lower abdominal problem commonly occurs in women after childbirth, but may also effect men and women who haven't experienced pregnancy. It's a result of weakened transverse abdominus and overactive external oblique muscles.
"We wake up in the morning with a flatter stomach, because we don't have all of the food and drink we consume in the day going through. Normally we wake up, empty our bladder and bowel, and then as the day goes on, we increase the fluids and what we eat, and this builds up and looks like bloat throughout the day."