You may think you weigh a certain number, but the truth is that hardly anyone weighs the same day after day. "In general, weight fluctuates up to 3-4 pounds daily due to water weight or lack of moving bowels, so I don't feel weighing oneself daily is necessary or a good measure of true weight loss," says Kessler.
“There's no reason to weigh yourself more than once a week. With daily water fluctuations, body weight can change drastically on a day-to-day basis,” says Rachel Fine, registered dietitian and owner of To the Pointe Nutrition. “Weighing yourself at the same time on a weekly basis will give you a more accurate picture.”
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.
“Your weight won't be consistent if you weigh yourself on Friday and Monday,” she says. “Many people have a different routine on the weekends. They might eat out more, drink alcohol or snack more. Compare that to Friday, if you've been eating consistently for five days, and you'll see a big difference.”
“Your skin is the largest organ in the body and absorbs fluid easily,” says Dr. Keith Kantor, a leading nutritionist and CEO of the Nutritional Addiction Mitigation Eating and Drinking (NAMED) program. “After a swim or a shower, your body can absorb 1 to 3 cups of water, increasing your true weight by a few pounds.”
Clinically underweight or dangerously skinny for the average woman: A BMI of 15, 16, 17, 18. A weight under 100–110 pounds (50kg)
As soon as you bend down, the muscles in your body that do the bending also act to pull up the lower half of your body. So this reduces the pressure your body places on the scales, and make you appear to weigh less.
Clothing. Wearing clothing while weighing yourself can add up to two pounds—more if you're wearing shoes. Again, this isn't a big deal if you consistently weigh yourself wearing the same thing, but since our clothes vary with our moods and seasons, it's best to go without when you step on the scale.
Your lowest weight of the day will be after you wake up and empty your bladder. You may choose to weigh yourself at another time of day, but you must continue to weigh yourself at that time on the same scale for an accurate measurement.
Losing significant amounts of weight quickly is not recommended and may be dangerous. The Center for Disease Control (CDC) recommend people looking to lose weight aim to lose between 1–2 pounds per week for safe, healthy weight loss.
Over the long term, it's smart to aim for losing 1 to 2 pounds (0.5 to 1 kilogram) a week. Generally to lose 1 to 2 pounds a week, you need to burn 500 to 1,000 calories more than you consume each day, through a lower calorie diet and regular physical activity.
"We can weigh 5, 6, 7 pounds more at night than we do first thing in the morning," Hunnes says. Part of that is thanks to all the salt we consume throughout the day; the other part is that we may not have fully digested (and excreted) everything we at and drank that day yet.
Exercise, eating habits, and even whether you drank any alcohol the night before can all affect the number on the scale. Generally speaking, though, you are going to weigh in with the greatest consistency in the morning when you have not eaten or participated in strenuous physical activity in several hours.
Weighing yourself isn't always a reliable method for monitoring your health, as weight fluctuates day to day. Stepping on the scale too often can have negative side effects. Weighing yourself frequently can create mental obstacles and even lead to overeating.
If you weigh yourself at night, you're going to weigh more than you actually do, according to Discover Good Nutrition. Weigh yourself first thing the mornings, after your body has had a full night to digest your food. Otherwise, you'll be seeing higher numbers that don't correlate to all of your hard work.
If you're the type of person who takes care of business first thing in the morning, weigh yourself right after you go. If you're more likely to go after breakfast, weigh yourself first so your meal doesn't add extra pounds to the scale. Either way works as long as you're consistent.
Yes, You Do Lose a Little Bit of Weight
“Most stool weighs about 100 grams or 0.25 pounds. This can vary based on a person's size and bathroom frequency. That said, poop is made up of about 75% water, so going to the bathroom gives off a little bit of water weight,” says Natalie Rizzo, MS, RD.
"We can weigh 5, 6, 7 pounds more at night than we do first thing in the morning," Hunnes says. Part of that is thanks to all the salt we consume throughout the day; the other part is that we may not have fully digested (and excreted) everything we at and drank that day yet.
As soon as you bend down, the muscles in your body that do the bending also act to pull up the lower half of your body. So this reduces the pressure your body places on the scales, and make you appear to weigh less.
Weighing yourself every day can help increase your awareness of your weight and weight-related behaviors. It may help you lose more weight and prevent you from gaining that weight back in the long-term. Daily self-weighing may just be that extra motivation you need to achieve your weight goals.
At night while we sleep, our bodies have a chance to get back into balance. Excess fluid that has accumulated during the day moves from the body's cells into the bloodstream, where it makes its way to the kidneys. In the morning, when we get up, we get rid of this extra fluid by peeing.
Daily weight fluctuation is normal. The average adult's weight fluctuates up to 5 or 6 pounds per day. It all comes down to what and when you eat, drink, exercise, and even sleep. Read on to learn more about how these factors affect the scale and when to weigh yourself for the most accurate results.
Clothing. Wearing clothing while weighing yourself can add up to two pounds—more if you're wearing shoes. Again, this isn't a big deal if you consistently weigh yourself wearing the same thing, but since our clothes vary with our moods and seasons, it's best to go without when you step on the scale.
Men can lop off nearly 2.5 lbs to account for their clothing while women can only subtract around 2.