What causes weight gain from snacking while teleworking? How to rethink portion sizes and timing

Is weight gain during telework caused by overeating or lack of exercise?

Do you worry about your weight after one snack too many on a weekday afternoon, and wonder if overeating is the only cause? In this article, we will explain the results of studies on step counts and sitting time, and how you can identify your own specific causes by separating the amount you eat from the amount you move.

Just how much lower are step counts and activity time for those who telework often?

A report published in the Health and Labour Sciences Research Results Database states that people who telework five or more days a week had approximately 70 minutes less total physical activity time and about 4,000 fewer steps per day compared to those who do not telework.

This result shows an association between the frequency of telework and the amount of physical activity, and it does not necessarily mean that teleworking itself is the direct cause. Try checking your own step count using a smartphone pedometer or similar tool.

The Ministry of Health, Labour and Welfare's e-Health Net defines sedentary behavior as waking behaviors characterized by an energy expenditure of 1.5 METs or less, while in a sitting or reclining posture. Furthermore, the 2013 National Health and Nutrition Survey found that 38% of men and 33% of women reported sitting for a total of 8 hours or more per day. On days when you have continuous desk work, try to recall not just your step count, but also how long you spent sitting.

Identify the situations where you end up eating more at home

When your work stops, you can reach the kitchen in just a few steps. You open the fridge, close it without taking anything, and on your way to make coffee, your hand reaches for the shelf where the snacks are kept. For those who telework, many people likely find themselves in such situations several times a day.

At home, food is just a few steps away from your desk. Try to recall these moments alongside the time and context, such as "immediately after a meeting" or "two hours after lunch." By determining whether you were actually hungry at those times or just had idle hands, it will become easier to write your next log.

Separate the amount you eat from the amount you move to find your own cause

Try writing down the amount you eat and the amount you move in the same notebook for a few days. For eating, record the items, time, and quantity (e.g., half a bag, two pieces). For physical activity, record your daily step count and how many times you stood up from your desk while working.

If you continue this for a few days to a week, you will likely see times when snacking is frequent or days when your step count is low. If days with many snacks overlap with days with low activity, both are worth reviewing. If one stands out more than the other, it is recommended to start there.

How the amount you eat and the amount you move relate to your body weight will be explained in the next chapter.

Which causes more weight gain: snacks or meals?

Whether something causes weight gain is not determined by the name of the food alone—snacks vs. meals. We will organize the perspective on daily totals, the characteristics of snacks that lead to overeating, and the relationship with specific areas of concern, based on official documents and research.

Determine whether you will gain weight by looking at your daily total

Suppose you added two afternoon snacks to a day where you ate your usual dinner. What matters for your weight is not whether it is a snack or a meal, but the total amount of food consumed that day.

Materials from the Ministry of Health, Labour and Welfare state that an excess in energy intake is evaluated by the balance with energy expenditure, and that obesity is used as an index of nutritional status reflecting this balance. Additionally, an information sheet from the Ministry of Health, Labour and Welfare notes that if there is no change in body weight or body composition, energy intake and expenditure can be considered equal. The same information sheet states that the energy required to reduce body fat by 1kg is approximately 7,000 kcal. This is a guideline for understanding the magnitude of energy and not a figure to predict weight changes.

A pamphlet from the Ministry of Health, Labour and Welfare suggests that consuming snacks and sugary drinks in addition to breakfast, lunch, and dinner may increase the risk of obesity. On days you eat snacks, try looking at the total combined with your meals and drinks.

What kind of snacks are likely to cause weight gain?

Rather than ranking snacks by name, it is easier to apply them to your own snacking habits if you look at their characteristics. You should be careful with snacks that are high in fat and sugar, and are small enough to be eaten in large quantities.

Imagine yourself eating small chocolates or cookies one by one while looking at your computer screen. You might be surprised at how many you ate by the time the bag is empty. If you decide on a set number of pieces before you start eating, it will be easier to keep track of the amount.

On the other hand, even with products lower in sugar and fat, if the quantity increases, your daily total will increase as well.

Is there a specific area where you gain weight from snacks?

Many people might feel that "when I eat snacks, it goes to my stomach." There is a cross-sectional study that examined 15,618 Japanese adults using data from the 2012 National Health and Nutrition Survey. This study found that women with a higher dietary energy density had a higher proportion of abdominal obesity (waist circumference of 80cm or more). The adjusted prevalence ratio between the highest and lowest groups was 1.07 (95% CI 1.02–1.12). No such association was observed in men.

However, this study looked at the diet as a whole, not just snacks. From this study, it cannot be said whether snacking alone causes fat to accumulate in specific areas. Rather than deciding what to eat based on concerns about specific body parts, record the amount and frequency of your snacks to observe your own changes.

Late-night snacking after 10 PM: How to manage quantity and selection?

For those nights when you get hungry after 10 PM, we will introduce how to spend your time after meals, how much to eat, research on the risk of insomnia linked to ultra-processed snacks, and how to decide on quantities and food choices when it’s late.

Check your post-meal routine and quantity before eating late at night

On days when work runs long and it is past 10 PM, the time between eating and going to bed becomes short. Before eating, check how many minutes you have until bedtime. If you have already eaten dinner, remember that amount too. As mentioned earlier, because whether you gain weight is determined by the daily total, it is recommended to think about late-night snacks in combination with your dinner. Put the portion you intend to eat on a plate before you start.

Research on the association between ultra-processed snacks and insomnia risk

A 2024 paper published in PubMed is a meta-analysis combining 7 observational studies. The results showed that higher intake of ultra-processed foods was associated with an increased risk of insomnia. Looking at just the two studies that examined snacks specifically, the same trend was observed.

This paper looked at the association with insomnia risk. Furthermore, because it is an observational study, it cannot be definitively stated that eating these foods is the cause of insomnia. If you find yourself snacking late at night, first look at the ingredients label on the bag and count how many items qualify as ultra-processed foods.

A realistic way to choose on late nights

On late nights, decide on the amount you will eat beforehand. If you limit yourself to one small bag of snacks and put only that amount on a plate, you won't have to keep reaching into the bag. Another method is to drink warm tea or hot water first, and then decide if you still want to eat. If you do eat, we recommend small, lighter portions. Tips for quantity guidelines and easy-to-eat foods are introduced in Recommended Snacks for Desk Work | How to Choose and Portion Foods That Are Easy to Eat During Work, so please refer to that as well.

Can you continue snacking while dieting by setting limits on quantity and frequency?

Even while dieting, you can continue snacking if you decide on the quantity and frequency. We will introduce how to set these limits, how to view the amount you stopped eating, and why you should continue setting limits on snacks even after improving your diet.

Do not quit completely; decide on the quantity and frequency

You intended to have just one piece of chocolate at 3 PM, but before you knew it, the bag was empty. If days like that are common, decide on the frequency beforehand, such as "at most once in the morning and once in the afternoon." For quantity, deciding on one pre-packaged single serving is best. If you eat what you decided to eat, it will be easier to reduce the days where you end up binge-eating at dinner as a reaction to restriction.

Look at the amount you stopped snacking as part of your overall diet

See if your dinner on days you stopped snacking has become larger than usual. Even if you stop your afternoon snack, if your rice or side dishes at dinner increase, your daily total may not change as mentioned before. If you write down the contents of your snacks and dinner for a few days, you will see where the amount you cut back has shifted. If your dinner has increased, we recommend keeping just one snack and returning your dinner to the usual amount.

Continue to decide on snack portions even after fixing your diet

There is a randomized crossover trial that compared the protein ratios in lunch and dinner, changing them from 10% to 30% of energy intake among 18 women of standard weight. This study investigated whether the protein ratio results in differences in daily energy intake. According to a 2011 paper published in PubMed, the results showed no significant difference in daily energy intake at any ratio. However, the subjects were limited to a small number of women. Regardless of improving the contents of your lunch and dinner, we recommend deciding on your snack portions in advance.

Snack quantity, content, and how to eat

When choosing snacks, where should you look on the nutritional information label? We will organize information for those who want to review their afternoon snacks based on quantity and how they eat, including the contents of studies on whole-wheat bread snacks and how to decide on portions instead of eating directly from the bag.

Look at energy and protein on the nutritional information label

According to the Consumer Affairs Agency, nutritional information labels showing energy, protein, fat, carbohydrates, and sodium (as salt equivalent) are mandatory for processed foods in principle. Among these, look at energy and protein for snacks.

A document from the Consumer Affairs Agency explains that protein also produces 4 kcal of energy per gram. Furthermore, there is no standard in this document for judging an individual's required amount based solely on the protein content on the label. These figures are best used for comparing one snack to another.

Example of snacks studied in relation to satiety

There is a research report comparing the substitution of regular bread snacks with whole-wheat bread snacks. In a randomized controlled crossover pilot study published in PubMed (2015), the subjects were 11 university students. The results showed that whole-wheat bread snacks provided higher satiety than regular bread, and energy intake for the remainder of the test day was also lower.

Because the number of people is small and the subjects are limited to university students, it cannot be said that this applies to everyone. However, it can serve as a clue for you to verify for yourself how satiety differs when the ingredients are different, even for the same type of bread.

Specific products are introduced in Recommended Foods for Snacks at Work | How to Choose and Easy-to-Eat Products, so please refer to that as well.

Put it on a plate and decide on an afternoon time to eat

If you have a meeting at 3 PM, put the portion you plan to eat on a plate before it starts. If you keep your hand in the bag, it becomes hard to know how much you have eaten. We recommend closing the bag and putting it in a drawer after you have placed the snack on your plate.

If you also decide on the time you will eat beforehand, the boundary for that day's snacking becomes clear, such as "just the portion on the plate at 3 PM."

Logging your "urge to eat" moments and replacement behaviors

The situations in the afternoon when you reach for a snack vary from person to person. We will introduce how to record your triggers, behaviors you can do instead of snacking, and how to change where you store your snacks, tailored to a day of teleworking.

Make a note of the triggers that make you want to eat

When you feel the urge to eat, write down the time and the situation at that moment in just one line. Something as short as "15:00, after meeting, chocolate" is enough. If you accumulate a few days' worth of notes, you will start to see the situations where you feel like eating, such as after meetings or when you hit a wall while creating documents.

Even just writing one line before eating provides a moment to pause.

Stand, drink, or walk as a substitute for snacking

When you feel like eating, first stand up from your seat and go pour yourself some water or tea in a glass. By going back and forth to the kitchen, you increase the number of times you stand up and move. If the feeling of wanting to eat remains after a few minutes, it is fine to walk around your house a little bit and then eat only the amount you decided on.

Change where you store your snacks

It is recommended to move your snacks to a cupboard slightly away from your work desk. If you leave them on your desk, they are within reach whenever you extend your hand. If they are in a cupboard, you will have to stand up every time you want to eat. If you go to get them while you are getting water or tea, you will further increase the number of times you stand up and move.

Nutritional comparison between commercial protein bars and BRAIN PRO

We distinguish protein bars chosen for snacking while teleworking based on the use of sweeteners and sugar, protein sources, and the order of ingredients. At the same time, we introduce the nutritional components and ingredients per 35g bar of BRAIN PRO.

How to choose when using a protein bar as a snack

For a protein bar you reach for during a break in creating afternoon documents, reading the first few items on the ingredients list will tell you what the main ingredients are. Next, trace what is used to provide sweetness and where the protein is derived from. Products with ingredients that are easy to imagine the taste of, such as cocoa or nuts, will also likely give you a clearer impression of the taste.

Difference between sweeteners and sugar

Some protein bars do not use white sugar and instead provide sweetness with syrups or sweeteners. What is used can be found by looking at the names of the sweeteners in the ingredients list. BRAIN PRO does not use white sugar; its ingredients list includes agave syrup, inulin syrup, and a sweetener (stevia). The sugar content is 4.9g per bar.

Difference in origin and amount of protein

The source of protein varies by product. BRAIN PRO uses pea protein derived from peas and does not use casein or animal-derived ingredients. The protein content is 11.1g per 35g bar. It is suitable for those who want to choose protein bars without animal ingredients or those who want to avoid casein.

Looking at the ingredients of BRAIN PRO

BRAIN PRO contains 190 kcal, 13.5g of fat, 7.1g of carbohydrates (4.9g of sugar, 2.2g of dietary fiber), and 0.4g of salt equivalent per 35g bar. Its ingredients are: almond paste, pea protein, almonds, soy puffs, cocoa powder, coconut oil, cacao butter, inulin syrup, agave syrup, lion's mane mushroom powder, rock salt, flavorings, and sweetener (stevia). It does not use wheat, preservatives, food coloring, or trans fats. It is recommended for those who want to keep a small bar handy before an afternoon meeting. However, it contains soy and almonds, so those with allergies to these should be careful.

Product	Content	Sugar	Artificial sweeteners	White sugar	Protein (origin)
Calorie Mate Chocolate Flavor	80g (4 bars)	39.7g	None	Used	8.7g / Soy, Wheat
Myprotein Layered Protein Bar Birthday Cake	60g	21g	Used (Sucralose)	Used	20g / Milk, Soy
1-Pon Manzoku Bar Protein White	39g	9.8g	None	Used	16g / Soy, Milk
SAVAS Soy Protein Bar Bitter Chocolate	45g	Not displayed (sugars 4.2g)	Used (Sucralose)	Used	16.5g / Soy
BRAIN PRO	35g	4.9g	None	None	11.1g / Plant-based (pea)

Figures for each product are based on the nutritional information posted on each manufacturer's official website as of September 25, 2026. These may change due to product revisions.

Frequently Asked Questions

What causes weight gain during full remote work?

During full remote work, both the amount you eat and the amount you move are likely to change. A report published in the Health and Labour Sciences Research Results Database states that people who telework five or more days a week had about 4,000 fewer steps per day compared to those who do not. For a few days, write down what you ate and your step count in the same notebook, and start by reviewing the one that stands out the most.

Why does eating after 10 PM cause weight gain?

We cannot provide a reason for why eating after 10 PM causes weight gain supported by official documents. Basically, whether you gain weight is determined by the total amount of food you ate that day. On days when you are late due to work, decide on the amount for your snack in advance combined with your dinner amount, and check the time until you go to bed. One method is to drink warm tea or hot water before eating, and then consider if you really want to eat.

What is a good snack for healthy weight gain?

Since research aimed at people who want to increase their body weight is not covered in this article, we cannot promise any weight changes based on food. When choosing, look at the energy and protein on the nutritional information label, and view it as an addition to your meals rather than a substitute. For example, BRAIN PRO is listed as 190 kcal and 11.1g of protein per 35g bar. If you are worried, such as if your weight continues to decrease, please consult a medical institution.

Summary

If you break down snacking while teleworking into the amount you eat, the amount you move, and the time you eat, you will likely find areas for improvement. First, try writing down what you ate and your step count in the same notebook for a few days. It is recommended that you do not quit snacking completely, but instead decide on the quantity, frequency, and time in advance. When choosing snacks, compare the energy and protein on the nutritional information labels.