A fitness blogger is on a mission to re-educate people about what calories actually look like by comparing so-called 'healthy' snacks to 'naughty' treats.

Lucy Mountain, aka The Fashion Fitness Foodie, posts Instagram pictures of crisps next to the same snack made from root vegetables, and vitamin-enriched breakfast biscuits next to a packet of McVitie's to show how these treats often contain a very similar number of calories.

The stunning blonde 25-year-old, from London has built up a following of 65,000 people with her self-dubbed 'no BS' approach which aims to prove that no food in of itself will help you to lose or make you put on weight.

Her aim is to teach people that they can eat what they want - whether it's a handful of Fruit Pastilles or a handful of almonds - and still get the body they desire if they put their food choices into the context of a mostly healthy lifestyle and pay attention to portion sizes.  Lucy, whose Instagram feed is littered with comparison photos and pictures of her enviable figure in fitness clothes, says she wants to teach people that they don't need to cut out any foods from their diet if they really love them.

Unlike many other Instagram fitness role models, she refreshingly admits to preferring a handful of Fruit Pastilles as a snack instead of almonds, and confesses to the occasional boozy night out. 'We're bombarded with these kind of accounts that you almost become numb to it all. 

'Right from the beginning I have wanted my account to actually add value to other people's lives - and I hope my food comparisons have been a great way to do this.'

Lucy's honest approach to fitness, food and healthy eating has won her legions of followers and inspired her to create a second Instagram account dedicated to her food comparisons.

Her photos bust the myth that some foods are fattening and some foods are best for fat loss. Instead, she says the same meal could help you to lose weight or to gain weight depending on your portion sizes, and on how many calories you are expending through exercise in a day compared to how many you are consuming. 

Her posts receive thousands of likes each, due to this honest and inspiring approach. 

She explained: 'No matter what I post, I'm 100 per cent myself and I think people appreciate that.