A weight loss expert has revealed the one "healthy" barbecue food he advises patients to steer clear of if they're keen on shedding fat - and it's probably not what you'd anticipate.

Despite many summer favourites being touted as guilt-free, Professor Franklin Joseph, consultant physician and head honcho at Dr Frank's Weight Loss Clinic, warns that some of the worst culprits are hiding in plain sight.

"Barbecue season is fantastic for socialising and savouring good food," Prof Joseph remarked. "But I always caution patients to be wary of so-called 'healthy' options - because some of the worst offenders aren't the burgers or sausages, but the things you reckon are the lighter choice."

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These concealed calorie traps can easily accumulate, particularly when you're nibbling at a barbecue over several hours.

Why halloumi isn't the healthy barbecue option, reports .

The one food Prof Joseph avoids is grilled halloumi.

"Halloumi is often perceived as the 'healthier' alternative on a barbecue menu, especially for vegetarians or those attempting to eat lighter," he stated. "But it's an absolute calorie bomb. A small portion - just two slices - can contain over 300 calories and around 25g of fat. And let's be honest, no one stops at two slices."

Prof Joseph explains that the combination of high fat, high salt and low satiety makes halloumi a poor choice for fat loss.

"You don't feel full from it in the same way you would from a lean protein like chicken or a piece of fish. It's moreish, salty, and the fat adds up fast. You can easily double or triple your calorie intake at a barbecue just by picking halloumi."

The issue with BBQs, Prof Joseph explains, is how effortlessly one can lose track of portion sizes.

"People tend to graze, go back for seconds, and have little bits here and there without realising how much they're actually eating," he said. "That's why it's so important to choose foods that will fill you up without blowing your calorie budget."

Better barbecue choices for fat loss.

Grilled chicken, fish, prawns, or veggie skewers packed with colourful vegetables are the best options for a lean, filling barbecue meal.

"They're high in protein, lower in fat and keep you satisfied for longer," Prof Joseph said. "It's a simple swap that makes a huge difference."

He also advises being mindful of sauces and oils. "A lot of people drizzle olive oil on veggies or salads, thinking it's healthy - and while it has benefits, those calories add up fast. Same goes for sugary sauces like sweet chilli or teriyaki - they can turn a low-calorie plate into a 600-calorie meal."

Prof Joseph's advice is straightforward: keep barbecue food light, fresh and flavourful without the heavy extras.