Junk food yummy but not good for tummy. yes it is completely correct, because junk food has 0% or very little nutritional value and often high in fat, sugar,salt, and calories.
that is not good for health. junk food cause obesity and excess fat, carbohydrates, and processed sugar found in junk food led to an increased risk of cardiovascular disease, diabetes, weight gain, and many other chronic health conditions.
so it 100% correct that Junk food yummy but not good for tummy.