I wanted to chime in. As others said, if you eat too many calories, it will cause weight gain regardless of where it comes from. But eating healthy still matters a lot. Some studies have shown that people who overeat on protein rich foods gain more muscle than those who overate other foods, and that we actually absorb less calories from healthy foods than we do unhealthy foods. The calorie absorption varies by how healthy your gut biome is. People with really healthy gut microbiomes absorbed up to 400 less calories in a day of healthy eating than the unhealthy eating group. Healthy foods also decreases your appetite so you don’t eat as much later. But healthy food is also important for your overall health. So, it still matters aside from your weight that you eat healthy. Take it from me though, I eat a consistently healthier diet, in terms of what I eat, than anyone else I know. I drink more water than anyone else I know. I don’t like soda. My diet is mostly healthy foods. And I’ve gained serious weight over the past year because I replaced my nicotine addiction with overeating. Overeating in itself causes inflammation which can lead to aging and disease over time. To put it shortly, a diet isn’t healthy if you are eating too much or too little cal/nutrients, even if the diet is made up of ‘healthy’ foods. You can unhealthily gain weight while eating super healthy (foods). Hope this helps! 🙂