With so many different diets and eating plans around these days, it can be difficult working out which food habits would be best suited to you and your body without a good deal of trial and error. But there might be a quick, easy and free way to work out what you should try – without you having to spend a fortune on new diet books or faddy ingredients.According to one health and fitness expert, you can actually work out which diet will suit you, simply by looking in the mirror. All you have to do is figure out which body type you have: ectomorph, mesomorph or endomorph.Speaking to Byrdie.co.uk, personal trainer and nutrition specialist Thomas Eastham described each body type and what they should eat – so have a look below to work out how you might want to try eating:EctomorphBody type: Eastham describes ectomorphs are "thin with smaller bone structures and thinner limbs". How to eat: "Ectomorphs generally do best with more carbohydrates in their diet, along with a moderate protein and lower fat intake. A nutrient distribution for this body type might be around 55% carbs, 25% protein, and 20% fat. But don't drive yourself crazy with the math. Just think higher carbs and lower fat," he says. Mesomorph Body type: Mesomorphs are described as having "medium-sixes bone structure and an athletic body".How to eat: 'Mesomorphs typically do best on a mixed diet, consisting of balanced carbohydrates, proteins, and fats. A macronutrient split of 40% carbohydrate, 30% protein, and 30% fat can work well,' says Eastham. EndormorphBody type: Endomorphs have "larger bone structure with higher amounts of total body mass and fat mass". How to eat: "A nutrient distribution for this body type might be around 25% carbs, 35% protein, and 40% fat," says Eastham. "Again, no math gymnastics. Just think higher fats and protein, lower carbs."