Kate Middleton has been dubbed as very skinny by concerned royal fans. Some of them are so worried about the Duchess of Cambridge’s weight and think that she may also be anorexic.

But on the online forum site Quora, one royal fan said that it is offensive to call Prince William’s wife too skinny. In the same way that it would be rude to call someone too fat.

Deanna Eppers, a royal watcher, also classified the mom of three as an ectomorph. She said that there are three different body shapes.

“Ectomorph is long and lean, difficult to put on weight, with many models or ballet dancers having this look to them. Mesomorph is muscular and athletic-looking. Neither skinny nor fat, they are in the middle and often put on muscle quickly. Many athletes are this type. Endomorph is softer and rounder in the body and face. They tend to put on weight more easily. Even with dieting, it can be difficult to lose the softer body type,” Eppers said.

The royal fan said that Middleton and her immediate family are all ectomorphs because they are thin and they also have long and lean limbs. Eppers said that because of this, Prince William’s wife may be one of those people who find it very hard to gain weight.

In fact, while she was pregnant with Prince George, Princess Charlotte, and Prince Louis, Middleton didn’t gain much weight. After giving birth, she didn’t also have a hard time bouncing back to her pre-pregnancy weight.

“It might be easy to look at Catherine and say she is too skinny when really she looks healthy. Her hair is glossy, her face is not gaunt and she does have the muscle to her. During her pregnancies, the Duchess of Cambridge had trouble keeping food down, and that might still affect her to a certain extent with food aversion, though I doubt it. From interviews it seems like she is an adventurous eater, enjoying new foods and loves a good spicy curry,” she said.

Kate Middleton Kate Middleton arrives to launch a new national support line at the charity Family Action on Jan. 22, 2019 in Lewisham, England.  Photo: Getty Images/Adrian Dennis