The Global "Obesity Pandemic" and Japan's Current Situation

According to estimates by the World Health Organization (WHO), about 39% of adults are overweight (BMI ≥ 25), and half of them are classified as obese (BMI ≥ 30). Although Japan has a relatively low obesity rate among OECD member countries, the Ministry of Health, Labour and Welfare's "National Health and Nutrition Survey" indicates that one in three men in their 20s to 40s has a BMI ≥ 25, with a particularly noticeable increase among the younger generation. Contributing factors include busy lifestyles, reliance on eating out, ready-to-eat meals, and convenience store foods, as well as an increase in single-person households and dual-income families. Notably, the increased consumption of ultra-processed foods (UPF) is accelerating obesity and related diseases, as warned in a review paper by Dr. Leigh Frame of George Washington University and others.

The Brazilian economic media InfoMoney cites the same paper, organizing "five major foods that easily lead to weight gain" as follows: ① French fries ② Sugary drinks ③ Red and processed meats ④ Refined wheat products ⑤ Desserts and sweets  . This article will thoroughly explain Japan's food environment and hints for behavioral change, focusing on these five items, in approximately 10,000 characters.

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1 Why the "Five Major Foods" Are Fattening—Common Mechanisms

1. High Energy Density

   Due to low water and fiber content and high fat and sugar content, calorie intake skyrockets even with the same weight.

2. Blood Sugar and Insulin Spikes

   Refined carbohydrates and high-GI carbohydrates derived from potatoes cause a rapid rise in postprandial blood sugar, leading to excessive insulin secretion→enhanced fat synthesis.

3. "Postprandial Reward" and Hyper-Palatability

   Processed foods that combine salt, sugar, and fats in a golden ratio stimulate the brain's reward system, reinforcing addictive behavior of "wanting to eat more."

4. Disruption of Gut Environment

   Additives such as emulsifiers and artificial sweeteners damage the intestinal mucosa, induce inflammation, and worsen insulin resistance.

5. Lack of Dietary Fiber and Micronutrients

   Deficiencies in vitamins and minerals hinder the function of metabolic enzymes, reducing fat-burning efficiency.

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2 Individual Risks of the Five Major Foods and the Japanese Lifestyle

2-1 French Fries

• Current Situation in Japan: The sales volume of French fries by the top three fast-food chains reached an all-time high in fiscal 2024. Convenience store "fried hot snacks" are also expanding.

• Issues: ① Double frying at high temperatures increases AGE (Advanced Glycation End-products), raising the risk of skin aging and arteriosclerosis. ② Potato-derived starch has a high GI. ③ Repeated heating of used oil increases oxidized lipids.

• Alternatives: Use an air fryer at home, lightly spray with olive oil, and heat at 200°C for 10 minutes. Enhance satisfaction with steamed sweet potatoes and cinnamon.

2-2 Sugary Beverages (Soft Drinks, Sweetened Milk Beverages, Sweetened Coffee Menu)

• Current Situation in Japan: About 40% of junior and senior high school students consume "4 or more soft drinks per week." One cup of tapioca drink is about 400 kcal.

• Issues: Liquid sugars do not require chewing, making it difficult for the satiety center to activate, resulting in "easy-to-drink calories." High fructose corn syrup is directly converted to triglycerides in the liver, promoting fatty liver.

• Alternatives: Infused water with sparkling water and frozen fruits. Add cinnamon to unsweetened latte to enhance satisfaction with aroma.

2-3 Red and Processed Meats

• Current Situation in Japan: The average daily meat consumption for men in their 20s is 120 g, 1.7 times that of 1980. Ham and sausages are breakfast staples.

• Issues: Excessive saturated fatty acids, processed products contain nitrites and phosphates. Overconsumption increases the risk of colorectal cancer and type 2 diabetes.

• Alternatives: Replace with soy meat or koya tofu steak twice a week. When eating meat, limit to 150 g of lean meat and pair with colorful vegetables for a "Mediterranean-style plate."

2-4 Refined Wheat Products (White Bread, Sweet Bread, Pasta)

• Current Situation in Japan: 63% of households have bread for breakfast. The sweet bread market increased by 8% year-on-year.

• Issues: Contains less than one-third of the dietary fiber compared to whole grains.Excessive intake of wheat gluten increases intestinal mucosal permeability, also known as the leaky gut hypothesis.

• Alternatives: 100% whole grain bread, oatmeal rice balls. For pasta, use whole grain durum and low-carb noodles half and half.

2-5 Desserts and Sweets

• Current Situation in Japan: Over 600 new convenience store sweets are released annually. With the spread of telework, "snacking while working" has increased, with sweets accounting for 12% of daily energy intake.

• Problems: The combination of sugar and saturated fatty acids is the ultimate "calorie bomb." Blood sugar spikes before bed can reduce sleep quality, leading to increased appetite the next day.

• Alternatives: Plain yogurt with frozen blueberries and 5 g of dark chocolate with 72% or more cacao. Prepare a manageable amount of homemade oatmeal cookies on weekends.

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3 "Dietary Reference Intakes for Japanese (2025 Edition)" Direction

The Ministry of Health, Labour and Welfare will publish a revised edition in 2024, clearly stating **"Make minimally processed foods the basis of staple foods, main dishes, and side dishes."** The recommended energy-producing nutrient ratio is carbohydrates 50-65 E%, fats 20-30 E% (with saturated fatty acids less than 7 E%). The upper limit for free sugars (free sugars + added sugars) is set at 10 E%, preferably 5 E%, making the restriction of sweetened beverages a policy issue  .

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4 Behavior Change Step Guide

Step	Goal	Specific Actions	Tips for Continuation
1	Visualize Your "Hidden Calories"	Record with a Meal App for 7 Days	Weekend Summary Input is OK
2	Eliminate Sugary Drinks	My Drink Bottle + Tea Bags	Gradual Transition from Low Sugar to No Sugar
3	Halve the Frequency of Fried Foods	Stir-fry or Steam on Weekdays, Fry Only on Sundays	Decide on a "Fried Food Day" with Family
4	Make Over 50% of Staples Whole Grain	Mix 30% Barley with White Rice / Buy Whole Grain Bread	Keep Mixed Grains in the Rice Cooker
5	Over 20g of Dietary Fiber Per Day	Morning: Fruit + Oatmeal, Lunch: Seaweed Salad, Dinner: Bean Dishes	Fix Miso Soup Ingredients to Mushrooms
6	Increase Basal Metabolism by Maintaining Muscle Strength	3 Minutes of Squats and Planks Morning and Evening	Set Before and After Brushing Teeth

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5 Case Study: Improvement Example of a 30s Office Worker, Mr. A

• Before

  
  

  • Morning: Sweet bread + Café latte (with sugar)

  • Lunch: Fried chicken bento + 500 ml cola

  • Dinner: Tonkotsu ramen + Gyoza + Beer

  • Snack: 1 bag of potato chips

  • Total Energy: 3,400 kcal

  
  

• After (8 weeks later)

  
  

  • Morning: Whole grain toast + Boiled egg + Black coffee

  • Lunch: Grilled chicken breast and salad + Miso soup

  • Dinner: Mixed grain rice + Miso mackerel + Steamed vegetables

  • Snack: 20 g of unsalted nuts

  • Total Energy: 2,100 kcal

  
  

Results: Weight -4.8 kg, Waist circumference -5 cm, Fasting blood glucose -8 mg/dL, Sleep quality score +15 points.Mr. A says, "Just by quitting potato chips and sweet lattes, my health dramatically changed."

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6 Eating Out & Convenience Store Utilization Techniques

1. Convenience Store: Make a basic set of salad chicken, cut salad, boiled egg, and unsweetened tea. Limit fried hot snacks to "up to twice a month."

2. Beef Bowl Chain: Leave half of the regular-sized rice and adjust the PFC balance with a "salad set + soft-boiled egg."

3. Cafe: Choose drip coffee or Americano. Limit sweets to one small financier and utilize the "sharing culture."

4. Drinking Party: Start with a highball for the first drink, limit fried chicken to three pieces. Order edamame and chilled tofu first to prevent "waiting calories."

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7 Policy & Social Perspectives—"Make the Environment Healthy by Default"

• Taxation & Labeling Obligations: After the introduction of the "sugar tax" in the UK, the per capita sugar purchase from soft drinks decreased by 10%. Discussions on a soft drink tax are also starting in Japan.

• School Lunch Reform: Whole grain bread and bean dishes at least twice a week. Use educational materials in food education classes to visualize the risks of UPF.

• Innovation in the Food Industry: Support research and development of plant-based meat, low GI bread, and sweets that do not rely on artificial sweeteners.

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8 Common Questions and Answers (Q&A)

Q1: Are sweet potato chips healthy?

A: If fried in oil, they have the same structure as French fries. Oven baking is recommended.

Q2: Are zero-calorie drinks okay?

A: There is a possibility that artificial sweeteners may trigger insulin secretion, so it is suggested to avoid regular consumption and switch to carbonated water or unsweetened tea.

Q3: Is it necessary to completely stop eating red meat?

A: It is not a problem if consumed as a protein source within 350 g per week. Focus on cuts like fillet and thigh, and be mindful of iron deficiency.

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9 Summary──Reframing UPF as an "exception"

The five major foods that are easy to gain weight from are deeply ingrained in our daily lives due to their affordability, convenience, and taste. However, through "environmental design" of "not buying, not keeping, not showing," it is possible to dramatically reduce the frequency of intake. Traditional Japanese cuisine is originally an excellent model of low energy density and high nutritional density, centered on fermented foods, seaweed, beans, fish, and vegetables.

"UPF as an exception, not a daily routine"—By adopting this mindset and accumulating small daily choices, it is possible to improve not only weight management but also mental health, sleep, and skin quality comprehensively. Start today by replacing one sweet soda with unsweetened green tea.

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*This article provides general health information and those with pre-existing conditions or undergoing medication therapy should consult with a doctor or registered dietitian.*

• InfoMoney"Quais são os 5 alimentos que mais engordam e que você deve evitar comer?"

• Ministry of Health, Labour and Welfare"Report of the Study Group on the Dietary Reference Intakes for Japanese (2025 Edition) (Full Text)"

• Ministry of Health, Labour and Welfare"Key Points for the Formulation of the Dietary Reference Intakes for Japanese (2025 Edition) (PDF Slides)"

• Ministry of Health, Labour and Welfare"Slide Collection of the Dietary Reference Intakes for Japanese (2025 Edition)"

Reference Article