Those trying to lose weight after often advised to up their protein intake to boost muscle mass and metabolism.
A weight loss expert has issued a stark warning about protein bars, however, revealing they could be secretly sabotaging your diet efforts.
The popular snacks, often marketed as healthy options for gym-goers and busy professionals, could be expanding your waistline, according to weight loss expert Professor Franklin Joseph.
Even the Centres for Disease Control and Prevention advises limiting the bars where possible due to their added sugar.
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GETTY"People assume that because a product is labelled as 'high in protein', it must be good for them," said Professor Joseph.
"But the reality is that most protein bars are highly processed and packed with artificial sweeteners, syrups and preservatives that can contribute to weight gain rather than weight loss."
Studies have shown that ultra-processed foods are strongly linked to obesity, with research published in The BMJ finding people who consume more tend to gain weight over time.
"The problem with protein bars is that they often contain more sugar and artificial additives than a standard chocolate bar," Professor Joseph explained.
Some bars contain up to 20 grams of sugar, causing blood sugar spikes followed by crashes that lead to hunger cravings. While manufacturers claim their bars keep you full, they often use low-quality protein isolates.
These don't provide the same satiety benefits as whole protein sources like eggs or Greek yoghurt.
Additionally, research published in Cell Metabolism suggests people who eat ultra-processed foods tend to consume more calories overall, as these foods interfere with natural hunger signals.
Instead of protein bars, Professor Joseph recommended whole, natural foods for effective weight loss.
"A handful of nuts and seeds provides protein and healthy fats, while a pot of Greek yoghurt with berries delivers both protein and fibre to keep hunger at bay," he said. "Not all protein bars are bad, but most of them are just ultra-processed junk with a protein label slapped on."
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Sugar can interfere with hunger
GETTYOther recommended alternatives include boiled eggs, cottage cheese with cucumber, and hummus with vegetable sticks.
These options provide high-quality protein, fibre and essential nutrients without the processed ingredients.
"If weight loss is your goal, you're much better off sticking to real, unprocessed foods that nourish your body properly."
Professor Joseph also stressed the importance of reading nutrition labels carefully.
