It might not be the first dish that springs to mind when thinking of Greggs, but the chain has credited its salad range for helping its jump in sales, appeasing customers longing for lighter options as the summer heat continues to scorch the UK.The British bakery chain recorded total sales of £1.1 billion for the 26 weeks to 27 June and claimed its 'more compelling' range of greens contributed to its resilience over the warmer months.But while the Greggs salad options have proved popular, just how healthy are they for you? And how do they compare to other salad options on the high street?Speaking to the Daily Mail, Ann Garry, CEO and Director of Nutrition Training at Health Coaches Academy, has revealed which of the salads are actually worth a purchase - and the others best avoided if attempting to be healthy.She told the Daily Mail: 'The problem with many high street salads is not the leaves or vegetables. It is that dressings, cheese, cured meat, pickled ingredients and oversized portions can quietly turn something marketed as light into one of the saltiest or highest-fat lunches available.'The word salad is doing a lot of work on the high street. The bowls in this line-up run from 180 calories to 668kcal, and from 1g of salt to 4g, which is two-thirds of what an adult should have in an entire day. They are all sold as the sensible option, and they are not remotely the same thing.'As a practical rule of thumb, I look for roughly 20g of protein and at least 10g of fibre in a substantial lunch, because that combination is more likely to keep you satisfied through the afternoon. The UK recommendation is 30g of fibre across the whole day. Also, do not reward or punish a salad on the basis of calories alone.'To help shoppers make the best-informed decision come lunchtime, the nutritionist has offered her insights on dishes from Greggs, Pret, Starbucks, Gail's, Caffe Nero and McDonald's.Read on to discover the high street salad rankings...