Which is a good recommendation for underweight people trying to gain weight?

For underweight individuals seeking to gain weight, it's important to focus on calorie-dense foods such as nuts, avocados, whole grains, and full-fat dairy products. Incorporating strength training exercises can help build muscle mass, which contributes to healthy weight gain. Eating more frequent, balanced meals and snacks can also help increase calorie intake. Additionally, consulting with a healthcare professional or registered dietitian can provide personalized guidance and support.