Imagine two people of equal height, one larger than the other, and say they lose an equal volume of belly fat. Let’s consider a circle around each of their waists- since they are the same height, they lose the same area of fat from the inside the two-dimensional circle we are considering.

If you take a given area away from a small circle, its circumference will decrease by more than when you take that same area away from a large circle, so the geometry of it means that the smaller person will have lost more circumference than the large one.

]]>I have lost 22 pounds and had no reduction in my waist size.

From a similar weight I lost approx. 40 pounds and my waist only dropped by 2 inches.

I would have thought that weight would be proportional to the square of waist size (like a cylinder) hence more weight loss needed at very heavy weights to lose an inch off the waist.

]]>Note that the end of the post says it’s about 6.1 pounds per inch for losses under 55 pounds. If you gain 30 pounds from a 32 inch waist, you’d end at about 37 inches

That is 37 = 32 + 30/6.1

I’m not sure where you are getting 10 lbs / inch from but the end of the post says that people like you who are losing under 55 pounds need to lose 6.1 pounds for a one inch reduction in waist.

There are other ways to arrive at this number. For instance the formula in this paper

https://bmcmedresmethodol.biomedcentral.com/articles/10.1186/1471-2288-12-115

Using your present height and weight, your waist is predicted to be

98 cm or 38.6 inches

(22.61306+2.520738*(27.4)+0.1583812*(40)−3.703501*(0)−1.736731*(0))

At 158 pounds, your waist is predicted to be

(22.61306+2.520738*(24.7)+0.1583812*(40)−3.703501*(0)−1.736731*(0))

91.2 cm or 35.9 inches

All I did was plugged in your current BMI of 27.4 and your target BMI of 24.7.

It predicted that if you lose 17 pounds, your waist will drop 2.7 inches.

This is 6.2 pounds per inch.

My estimate was 6.1 pounds per inch.

I looked at a handful of papers in the academic literature, and they found that a 1 KG loss is associated with about .9cm waist circumference.

This is also about 6.2 pounds per inch.

]]>Been trying to figure out this myself, but there will be a few of different factors that will change the number (mainly height and current weight).

I used the numbers of my own weight gain through the years and figured out that the relationship is not linear/constant, and the higher is your current weight, higher is the number of pounds to reduce your waist size.