Some individuals take frequent snacks and others seldom take snacks. Both types can be healthy or unhealthy. There’s poor correlation between personal health and snacking habit. (Comparable to the correlation between health and zodiac.)

What matters is possibly 1) calorie 2) quality of nutrition. Let me focus on calorie for now.

Some snackers (me for decades) eat hundreds of calories in a single snack. After the snack, some snackers delay/skip meals while other snackers don’t. The daily total calorie intake can skyrocket.

Effect on daily Total calorie is Mostly psychological in my case. For decades, my brain was trained to crave for snacks in late afternoon and late night. After the afternoon snack, the home meal is a real battle I win or lose every day.