This bar is 471 kcal with 28.6 g sugar per 100 g — nearly as sugary as candy. A meta-analysis of 68 studies (Te Morenga et al., BMJ 2013) found reducing sugar lowered body weight by ~0.80 kg. The "granola bar" framing masks a dessert profile.
How should I track Granola bars, hard, plain?
Granola bars, hard, plain is high in magnesium. When it comes to Granola bars, hard, plain, weighing beats counting every time. Snack pieces vary in size, and a handful from a bag can easily be 50–100% more than the label serving. Research (Almiron-Roig et al., Appetite 2013) shows that people consistently underestimate portions of calorie-dense snacks. Another common trap: multi-serving packages. The label might show 150 calories "per serving," but if the bag contains three servings, you are really looking at 450 calories. Always check whether values are per piece, per serving, or per package.