It takes a certain amount of bravery to open a restaurant serving kale and celery shakes in Glasgow.

After all, this is a city which is most closely associated with the smell of square sausage, according to its residents.

Yet, when Prep Fitness Kitchen opened its doors a few weeks ago it would seem a leaner, healthier Glasgow was happily willing to bite.

Ahead of launch, 10,000 people had already signed up to the restaurant's Facebook page.

Once its juicers were revved up, the queue for lean chicken and smashed yams stretched right out the door.

So, could this protein pumping venture usher in Scotland's next big foodie trend?

With plans already in place to open another branch in Edinburgh this summer, Prep is the latest in a line of fitness restaurants launched in Britain over the last five years.

Gyms Kitchen, the UK's first protein-based restaurant, proved to be enormously popular when it opened in London in 2012. Keen health aficionados from pro-wrestlers to the cast of Towie gave it their public backing.

Yet until now, its carefully constructed menu of "fast food that's guilt-free" hadn't quite crept north of the border.

"I realised that there were very few places in Scotland where I could eat out and still keep track of my daily macronutrients and calorie intake," says Prep Fitness Kitchen owner David Buchan.

"We've taken a bit of a battering in the past for our diets but I think people are changing their approach to a healthy lifestyle."

Prepared by a Michelin-trained chef, Prep's macro-specific meals follow smartly off the back of the tracking trend which involves people using gadgets like Fitbits or smartphone apps to record their food intake.

Apps such as MyFitnessPal and Lose It have signed up more than 100 million users since their launch a decade ago.

Prep's take on tracking allows you to build your own balanced meal, choosing lean meats or fish for example with whole wheat pasta to take away or even have delivered daily to your door.

"The protein pancakes are actually quite good," says Liam Jarvis, 25, one Glasgow gym goer who popped in to try Prep's offerings.

"You can tell they're not quite the same as regular pancakes but you get banana and chocolate with them so they still taste good."

It also has an arsenal of healthy looking people to serve customers, including sports nutritionists, personal trainers, dietetics, bodybuilding champions and a professional wrestler.

You can also boosts your juices or shakes, with a 50p shot of ginseng or creatine - an organic energy acid - or a £1.50 shot of extra protein if you need it.

Given that Food Standards Scotland recently announced that the nation has been missing healthy eating targets for the last 15 years, having your meals carefully prepped for you like a celebrity - but without the hefty pricetag - may seem like an attractive option.

As Scottish food blogger, Phil Cook, of Phil's Food World says: "I think the attitude towards food is changing for the better, albeit slowly. For me, it largely comes down to age, demographics and accessibility.

"It seems that this generation of young professionals/graduates (your quinoa and avocado fans if you like) take a keen interest in health and wellbeing but it also seems that there is an expert or a survey reporting record levels of child obesity every other month - it's very tough to judge."

"What is encouraging is the amount of press and debate going on regarding this issue," adds Phil.

"While I feel we are beginning to improve the way we think about food, we need to keep educating and raising awareness of the issue, particularly at an early age and with young parents, so that children get off on the right foot.

"Restaurants like Prep can only be a good thing as they will help raise awareness and encourage diners of all ages."

The restaurant’s celebrity backers certainly think so. Former Team GB swimmers Lee Forster and Charlie Turner recently established protein brand Neat Nutrition which has attracted a host of professional athletes.

"Our product has been used in a lot of the recipes at Prep, like the protein pancakes," says Lee, looking down at a menu option of post-workout drinks.

The watermelon, apple, lemon and Himalayan sea salt juice seems to have caught his eye.

"There are a few places similar to this in London but this is definitely the best example of a heath restaurant that we've seen."

"We're at the front of seeing how the market is changing," adds Charlie.

"When we were growing up, it was all about Oasis, the Gallagher brothers and smoking - take a snapshot of society now and it's all about Ellie Goulding, doing boxing and eating granola.”

All three men are hoping they'll be in this project for the long haul and are already laying the groundwork for the Edinburgh branch.

"We've found an area close to where the gyms are and we'll hopefully launch there early in the summer," says David.

"There is a growing trend for health options in Scotland right now and we're proud to be part of that."