Losing weight is challenging, especially if you're not sure where to start. The good news? You don't have to be a personal trainer or MD to reach your goal; you just have to know one. INSIDER asked the experts to weigh in on their top weight loss tips, and here's what they had to say. 18 Don't always trust the scale. Africa StudioShutterstock Depending on the day, the bathroom scale is either the most loved or the most hated item in your house.