HAVING friends over for a dinner party has never been more difficult, with gluten and lactose intolerances almost guaranteed to be an uninvited tag-along with a guest or two.

The nation's biggest self-published title 4 Ingredients co-founder and director Kim McCosker said she was constantly confronted with questions from readers about how to adapt meals to cater for those with allergies and food intolerances.

So much so, she decided to write a new book dedicated to just that.

"If I had a dime for every time someone said to me 'I can't have lactose' or 'I can't have gluten', 'I'm coeliac', 'I have a peanut allergy'," Mrs McCosker said.

With one in 100 people diagnosed as coeliac and one in 20 diagnosed with gluten intolerance, catering for the masses these days is just not as easy as whipping up a roast and potato bake for all to dig in.

"So I set out to write the easiest gluten free lactose free recipe book ever - which then turned into three books," Mrs McCosker said.

"So the world's easiest cookbook grew into the Wellness Trilogy - Gluten Free Lactose Free, Diabetes and Allergies."

Gluten Free, Lactose Free is the first of three to be launched.

It shows readers how to make the falsely accused "bland" gluten- and lactose- free food delicious.

"The most important ingredient in any recipe for me is flavour," Mrs McCosker said.

"So it's about substituting ingredients.

"Gluten free is gloriously flavoursome."

Gluten Free, Lactose Free can be purchased from Big W in Warwick for $14 - currently on sale - or from 4ingredients.com.au.