Celebrity therapist and weight loss expert who has appeared on shows such as Supersize Vs Superskinny and Celebrity Fit Club. marisa is also author of You Can Be Thin (£8.99, Sphere). keep portable FOODS handy One of the main reasons diets fail is if you’re rushing around and end up skipping meals. You then get so hungry you end up grabbing a calorie-laden roll, bar of chocolate or a croissant. I recommend keeping some portable healthy foods handy – especially if you’re travelling – such as almonds, nuts, seeds, an apple or even a small can of tuna. That way if you end up missing a meal and feeling ravenous, you’re never caught short, so you don’t end up breaking your diet and filling up on empty calories. A good tactic is to keep small sachets of plant-based protein powder in your handbag. That way you can just mix it with water to keep hunger pangs at bay. ✱ try organic pea protein powder by rise organics, £9.99 for 300g.