Kim Kardashian is showing off her 70-pound, post-baby weight loss with a 24-inch waist.
On Monday, the mother of three revealed her measurements in a video shared on her app, shot during a book club meeting with pals Chrissy Teigen and hairstylist Jen Atkin, and sister Kourtney Kardashian.
"I can't take your hips seriously right now," Kourtney said to Kim, according to People. "Because your waist is so small and your hips are so big."
Atkin asked Kim for her numbers and she revealed it was 24 inches, which Atkin called "insane."
The reality star also posted an Instagram pic Tuesday showing off her tiny waist in a black string bikini, the result of a whole foods diet and intensive workouts with trainer Melissa Alcantara.
Waist measurements are now considered a more accurate marker of obesity, rather than the BMI, (body mass index) - a measure of body fat based on a person's weight and height. According to the Centers for Disease Control and Prevention, a high BMI is correlated with body fat and some weight-related diseases; however, the formula is controversial because it gives only a general snapshot of a person's weight without including factors such as muscle mass.
Research published in the May 2017 edition of the journal PLOS ONE found that measuring waist-height ratio (WHtR), by dividing waist by height, is a better barometer for determining a healthy size.
Quartz analyzed the PLOS ONE study in the context of earlier research published in the journal Nutrition Research Reviews, which found that a person's disease risk increases with a WHtR above .50. The publication also created a handy calculator to determine your own measurements, bearing in mind the study's general rule: "Keep your waist to less than half your height." As the article pointed out, "That means someone who is 5 foot 5 (65 inches; 167.64 centimeters)should maintain a waistline smaller than 33 inches, or 84 centimeters."
To supplement the second study, co-author Margaret Ashwell of City University London offered a "Shape Chart," outlining the health risks associated with various body types based on measurements.
Using the calculator and the chart, here are Kim's stats: The star is 5 foot 3 inches (63 inches) with a 24-inch waist, categorizing her body type a "chili" - apparently the healthiest type on the chart. The chart's takeaway for "chili" types: "You should take care. You will not need to decrease your waistline."
In other words, Kim looks great as is.