When it comes to the calories you consume each and every day, form matters. A study in the journal Obesity exposed people to the same number of calories in liquid or solid form only to find that post-meal hunger and desire to eat were greater when subjects consumed liquid calories. It appears that a solid meal leads to a greater drop in levels of the hunger-inducing hormone ghrelin, which could help tame your appetite. Similarly, the fibrous structure in whole fruit helps slow the absorption of its naturally occurring sugars, which can contribute to satiety. The takeaway is that the body doesn’t register 300 liquid calories in the same way it does if those 300 calories came in the form of whole food which could lead to increased hunger and higher overall daily calorie intake. Hence, one reason for the strong association between soda intake and weight gain.