Summer weight gain is real: Here’s why and how to avoid it

Most people (including me) assume that end-of-year holidays are when the weight creeps on. Cooler weather, comfort food, endless gatherings from Thanksgiving straight through New Year’s. That narrative is so embedded that we barely question it.

But we might just be focused on the wrong season. And I personally found this truly surprising.

Does summer cause weight gain?

Yes, and the research is fairly consistent on this! Weight gain is more prevalent during the summer months than in the fall or winter. And not just in adults. Across all age groups.

In fact, a study following over 18,000 children from the start of kindergarten through the end of second grade found that weight gain was significantly more pronounced during summer breaks than during the school year. The structured environment of school, it turns out, does a lot of quiet nutritional work that we don’t fully appreciate until it’s gone.

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Why do people gain weight in summer?

As I think about this, it makes total sense. Summer is, at its core, a season of unstructured eating. Routines dissolve. Social calendars fill up. Weddings, graduations, backyard barbecues, beach days, road trips and vacations all stack on top of each other from late May through Labor Day.

Each one comes with its own invitation to eat and drink in ways that feel celebratory in the moment but are cumulative over three months.

The foods at these events are not designed with your cardiovascular health in mind either. High-fat meats off the grill, mayonnaise-heavy salads, chips, ice cream.

And those drinks! Whether alcoholic or not, they carry a calorie burden that most people simply don’t account for. A frozen tropical drink or a mocktail piña colada can easily run 300 to 400 calories. That’s before you’ve consumed a bite of food.

Longer days also mean more hours of socializing, which means more hours of eating and drinking in environments where it’s genuinely hard to track how much you’ve consumed.

How to avoid summer weight gain

None of this means summer should be a season of deprivation. That’s not the point. But awareness matters, and a few proactive habits make a real difference.

Plan before you arrive. If you know you’re heading to a cookout or a long drive, eat something first. A handful of almonds, a hard-boiled egg, or a protein-rich snack before you walk in the door changes what you reach for when you get there.

Watch the beverages. This is where a lot of calories disappear without a trace. Unsweetened iced tea, sparkling water, or plain water with citrus are not consolation prizes. They are smart choices that leave room for the food you actually want.

Use a plate. Standing at a buffet table makes portion awareness nearly impossible. Taking a plate and sitting down with it changes the entire dynamic.

Pack your own food when you can. Cut vegetables and hummus, watermelon, quinoa salads, turkey roll-ups, fruit. These travel well and take almost no effort to prepare ahead of time. For road trips especially, having your own cooler of food is one of the most effective things you can do.

Focus on what you’re adding, not what you’re restricting. If you orient your summer around getting more colorful produce, more water, more fiber and lean protein at meals, the less-useful stuff naturally gets crowded out. 

The bottom line

Summer is worth enjoying fully, and the food is often wonderful. But going in with eyes wide open, understanding that this season carries real nutritional risk for adults and children alike, and making a few proactive choices can make a meaningful difference by the time September rolls around.