Tired and grumpy? Expert reveals the 8 best foods to boost your energy - including sweet potato fries

If you're falling asleep at your desk mid-afternoon, energy-boosting foods can help, says London-based nutritionist Rick Hay. The protein, carbohydrates and vitamins in a banana and almond butter snack will energise you and improve your mood. And swapping bread, pasta and rice for sweet potatoes - which release sugar into the bloodstream more slowly - could lead to a steadier stream of energy throughought the day. Here, he reveals his top eight energy-boosting foods, including (from left to right) nuts, spinach, maca powder, peanut butter, sweet potato and salmo. Mail