Why you don't eat enough vegetables — even if you think you do

Most Danes believe they eat enough greens, but research shows otherwise: Over 60% do not get the recommended 600 grams of fruit and vegetables daily. Even if you eat salad for lunch and vegetables for dinner, your actual intake of fiber, vitamins, and minerals may still be insufficient. This article explains why it is so difficult to eat enough greens in everyday life, what consequences it has, and what you can specifically do about it.

Why do health authorities say we should eat greens?

The Danish Health Authority recommends a minimum of 600 grams of fruit and vegetables daily, divided into at least 300 grams of vegetables and 300 grams of fruit. This recommendation is based on decades of research showing a connection between a high intake of plant-based foods and a lower risk of cardiovascular diseases, type 2 diabetes, and certain types of cancer.

Vegetables provide essential nutrients such as vitamin C, folate, potassium, and magnesium. They are also our primary source of dietary fiber, which is crucial for healthy digestion, gut flora, and stable blood sugar. A 2023 study among Danish adults showed that only 15% of men and 25% of women meet the recommendations.

What is the problem with Danes' vegetable intake?

Although we know that greens are healthy, there is a significant difference between knowledge and action. DTU Food Institute's dietary surveys point to several patterns:

• Overestimated intake: Many overestimate how many greens they actually eat when asked
• Limited variety: Most Danes regularly eat only 5-7 different types of vegetables
• Lack of fiber intake: The average Dane gets only 20-22 grams of fiber daily compared to the recommended 25-35 grams
• Seasonal fluctuations: Vegetable intake drops significantly during the winter months

A 2024 study from the University of Copenhagen showed that although 78% of participants believed they ate enough greens, the actual figure was only 23% when they kept a food diary.

Why is it so difficult to get enough greens in everyday life?

There are several practical barriers that make it difficult to reach the 600 grams daily:

Preparation time: Vegetables require washing, peeling, and cooking. In a busy daily life, quick solutions are often prioritized over time-consuming cooking. When you come home at 6 PM after work and need to get food on the table before the children need a bath, it's easier to choose pasta with meat sauce than a vegetable-rich ratatouille.

Shelf life: Fresh vegetables have a short shelf life. If you don't plan your shopping and meals carefully, a lot ends up in the trash. This frustrates many and makes them buy less next time — and thus also eat less.

Taste and habits: Many adult Danes grew up with a relatively limited vegetable palette — potatoes, carrots, peas, and perhaps beans. Expanding the repertoire requires a willingness to experiment and accept that new things take time to get used to.

Lack of satiety: Vegetables are voluminous but low in energy. If you don't eat enough protein and fat with them, you may feel unsatiated shortly after the meal.

What are the consequences of insufficient vegetable intake?

When you don't get enough greens, your body feels it in several ways. Fiber deficiency directly affects digestion and gut flora and can lead to irregular digestion, constipation, or bloating. Fiber acts as food for beneficial gut bacteria — if they don't get enough nutrients, the diversity of your microbiome is reduced.

Wastyk et al. (2021) showed in a randomized study from Stanford University that increased intake of high-fiber and fermented foods over 10 weeks significantly increased microbiome diversity in healthy adults. Participants who ate more fiber and fermented foods also had lower inflammation markers.

Vitamin C and fatigue: Vegetables such as broccoli, Brussels sprouts, and bell peppers are rich in vitamin C. Vitamin C can help reduce tiredness and fatigue (1). If you don't get enough vitamin C through your diet, you may experience increased fatigue.

Constipation and bloating: When fiber intake is low, food moves more slowly through the gut. This can lead to hard stools, less frequent bowel movements, and abdominal discomfort. Paradoxically, sudden attempts to "correct" by eating much more fiber at once can also cause bloating if the gut is not used to it.

How does low fiber deficiency affect your energy level?

Fiber stabilizes blood sugar by slowing the absorption of carbohydrates. If you lack fiber, blood sugar rises and falls more quickly after meals. This causes energy fluctuations throughout the day — you feel tired after lunch, crave sugar in the afternoon, and lack energy for exercise in the evening.

Dietary fiber — especially soluble fiber from vegetables such as carrots, leeks, and Brussels sprouts — also provides a feeling of fullness. If you don't get enough, you may eat more often and more of other foods, which can affect weight over time.

Which vegetables provide the most nutrients per gram?

All vegetables have value, but some are more nutrient-dense than others. Here are examples of vegetables that deliver a lot of nutrients relative to their weight:

Leafy greens: Spinach, kale, Brussels sprouts, and arugula contain vitamin K, folate, iron, and calcium. 100 grams of raw spinach provides over 150% of your daily requirement for vitamin K.

Cruciferous vegetables: Broccoli, cauliflower, Brussels sprouts, and kale contain glucosinolates and vitamin C. Broccoli is also a good source of folate and potassium.

Root vegetables: Carrots, beets, and celeriac are rich in fiber and various antioxidants. Carrots provide beta-carotene, which is converted to vitamin A in the body. Vitamin A can help support the immune system (2).

Onion family: Garlic, onions, and leeks contain prebiotic fibers that nourish gut bacteria. They also provide sulfur compounds that contribute to their characteristic flavor.

Should you prioritize raw or cooked vegetables?

Both have advantages. Raw vegetables retain heat-sensitive vitamin C better, while cooked vegetables are often easier to eat in larger quantities and can increase the bioavailability of certain nutrients such as lycopene in tomatoes and beta-carotene in carrots.

Most importantly, eat vegetables in the form you can actually consume. A steamed broccoli you eat is better than a raw broccoli that goes to waste.

How can you realistically get more greens into your daily life?

Here are concrete strategies that actually work in a busy everyday life:

1. Start with breakfast

Many Danes do not eat any vegetables for breakfast. Try these simple measures:

• Add spinach, mushrooms, or tomatoes to scrambled eggs
• Mix avocado on rye bread with seeds
• Add chopped cucumber, bell pepper, or radishes to breakfast bread
• Make a green smoothie with spinach, banana, and berries

100 grams of spinach for breakfast already gives you 1/6 of your daily vegetable recommendation.

2. Optimize lunch and dinner

Lunch: Fill half your plate or lunchbox with vegetables. This can be salad, carrots, cucumber, bell pepper, tomatoes, or steamed vegetables from the night before.

Dinner: Make dishes where vegetables are the main ingredient — not just a side dish. Stir-fries, vegetable soups, oven-baked vegetables with quinoa, or a large salad with legumes and vegetables.

3. Use frozen vegetables strategically

Frozen vegetables are often more nutritious than "fresh" ones that have been in the store for days. They are frozen shortly after harvest and retain nutrients well. Always keep these in the freezer:

• Broccoli florets
• Cauliflower rice
• Spinach
• Peas
• Wok vegetable mix

They can be added directly to stir-fries, soups, or as a side dish without preparation.

4. Meal prep strategically

You don't have to prepare all of the week's meals, but you can prepare vegetables:

• Cut carrots, bell pepper, cucumber, and celery into sticks on Sunday — store in cold water in the refrigerator
• Oven-bake large portions of vegetables (squash, eggplant, bell pepper, onion) for 2-3 days
• Make large portions of vegetable soup that can be frozen in individual portions

5. Hide vegetables in other dishes

If you find it difficult to eat large quantities of visible vegetables:

• Blend vegetables into meat sauce — carrot, celery, zucchini become invisible
• Use cauliflower rice as a base instead of regular rice
• Mix zucchini or pumpkin into lasagna or pasta bolognese
• Add chopped spinach or kale to meatballs

Are there situations where it is extra difficult to get enough greens?

Certain life situations make it particularly challenging:

For weight loss treatment: People taking GLP-1 medication often experience early satiety and nausea. A 2024 study showed that many patients reported constipation as a side effect. This is due to both the medication itself and reduced food intake in general — including fiber. Mozaffarian et al. (2025) pointed out that it is essential to prioritize nutrient-dense food during treatment to avoid nutritional deficiencies.

During busy periods: When the calendar is full and stress is high, it's easy to choose quick solutions. Fast food and takeaway typically contain very few greens — a burger with lettuce might provide 20 grams of vegetables.

When traveling and on business trips: Hotel breakfasts and restaurant meals are often protein and carbohydrate-dominated with vegetables as a small garnish. If you eat out for several days in a row, your total vegetable intake can be very low.

What can you do in these situations?

Even under difficult circumstances, you can make small adjustments:

• Order extra salad or vegetables when eating out
• Bring frozen smoothie packs with spinach and fruit to the office
• Eat vegetable sticks with hummus as a snack between meetings
• Choose vegetable-rich takeaway dishes such as poké bowls, Vietnamese salads, or vegetable curry

How do you know if you are getting enough fiber?

There is no simple test for fiber intake, but you can observe body signals:

Good signs of adequate fiber intake:

• Regular bowel movements 1-2 times daily
• Stool is soft but formed
• You feel full for several hours after meals
• Stable energy levels without significant blood sugar fluctuations
• No bloating or cramps

Signs of too low fiber intake:

• Constipation — bowel movements fewer than 3 times a week
• Hard or lumpy stools
• Bloating and abdominal discomfort
• Hunger shortly after meals
• Strong sugar cravings between meals

If you want to increase your fiber intake, do it gradually over 2-3 weeks. Suddenly high fiber intake without adaptation can paradoxically cause bloating and discomfort. Also drink more water — fiber binds fluid and the body needs extra fluid to handle it.

Is there a difference in fiber types?

Yes, and it is relevant for your digestion and gut flora. There are two main types:

Soluble fibers dissolve in water and form a gel-like consistency. They are found in apples, carrots, oats, beans, and lentils. These fibers:

• Slow down the absorption of sugar and stabilize blood sugar
• Lower cholesterol by binding bile salts
• Provide a good feeling of fullness
• Act as prebiotics and nourish beneficial gut bacteria

Insoluble fibers do not dissolve in water and pass relatively undigested through the gut. They are found in whole grains, nuts, beans, and most vegetables. These fibers:

• Increase stool volume
• Promote intestinal transit and counteract constipation
• Provide mechanical stimulation of the intestinal wall

Chicory contains inulin, which can support normal digestion (3). You get inulin from chicory root, onions, garlic, leeks, artichokes, and bananas.

FAQ — Frequently asked questions about vegetable intake

How many greens should I eat every day?

The Danish Health Authority recommends a minimum of 600 grams of fruit and vegetables daily, divided into 300 grams of vegetables and 300 grams of fruit. This corresponds to approx. 4-5 handfuls of vegetables spread throughout the day's meals.

Do potatoes count towards the vegetable recommendation?

No, nutritionally, potatoes are considered starchy carbohydrates and do not count towards the 600 grams of fruit and vegetables. The same applies to sweet potatoes, although they contain more fiber and vitamin A than regular potatoes.

Are smoothies a good way to get greens?

Yes, green smoothies can be effective if they primarily consist of vegetables such as spinach, kale, or cucumber combined with a little fruit. However, be aware that blending reduces the feeling of fullness compared to eating whole vegetables, so smoothies should supplement — not replace — whole vegetables in the diet.