News worth double-tapping: that Insta feed can help you drop kilos. A University of Washington study found people who use Instagram as a food diary ate more healthily and stuck to their goals. How? Followers hold you accountable, while a grid of pics shows a snapshot of your diet. Be detailed in your posts, says Kathleen Vuong (@whatkateats), who lost nearly 5kg after starting a #fooddiary account. So, instead of ‘Awesome lunch today!’ write ‘Spicy salmon salad with green tea’ – specific captions help you remember and re-create meals.