Being naturally strikingly beautiful.
Good genes. (Her mother was the same.)
Never seen her with a tan.
Having a fuller figure. (I remember thinking how my wrinkles seemed to have disappeared at certain points in my life. Turns out I’d also gained weight and had plumper cheeks…) And that’s not an insult before anyone sensitive/looking for an argument says so - it is part of why she is so attractive!
Maintaining a similar ish weight and avoiding yo-yo dieting over the years which can show in the face with age.
A fairly Mediterranean diet much of the time perhaps. Nigella has said she loves Italian-inspired cooking as shown in some of her books, series etc. She isn’t afraid of oil and butter. I truly believe it moisturises from the inside out. My skin also looks best when I’ve eaten more oily fish than usual.
She has probably had fillers and/or Botox. It looks like she has as her cheeks have that roundness and she’s in the public eye where little enhancements are more common. A huge part of her identity as a cook was her sex appeal - it’s not really a thing now, yes - so I wouldn’t be surprised if looking after herself included a little enhancement. But if she has, it’s very well done.
Good lighting too on her shows!
I bloody love Nigella, her innuendoes and inimitable descriptions of food.