Oh my, an instructional video on how to create an eating disorder
.
But no seriously you have to be very careful with any form of forced eating, as any early childhood negative associations with food contribute hugely to adult eating disorders later like anorexia, bulimia, binging or even just good ol' over-eating (which is an eating disorder in itself though is rarely thought of as being the same as the others).
For myself, my eldest isn't fussy and will eat things that I wouldn't even "expect" an 8 year old to eat (very spicy food, etc.). Veg she will wolf down so long as it has gravy. Not plain but tbqfh neither would I.
My youngest is extremely "fussy" but that's because she has some OCD traits with her autism... sometimes she will eat literally only one type of food for weeks. Generally she will eat only processed meats (sausages, salami) and she'll eat pretty much anything white-carby. Lately she loves eggs which is a huge positive. Zero veg, very little fruit. She has supplements to make up for what she doesn't get from food but it's not ideal.