Eat Your Veggies — But How Much Do We Actually Need?

“Eat your vegetables” is one piece of nutritional advice that has survived almost every diet trend imaginable. Low-fat, low-carb, paleo, Mediterranean and bodybuilding diets all somehow keep vegetables on the menu. With good reason: they provide fibre, vitamins, minerals and thousands of naturally occurring plant compounds while generally contributing relatively few calories. But how much do we actually need? 

1. How Much Should We Eat?

Australian guidelines recommend 6 serves of vegetables per day for men aged 19–50 and 5 serves for women, with requirements changing slightly with age. A serve is about 75 g — roughly half a cup of cooked vegetables, one cup of leafy salad or one medium tomato. That puts a useful daily target around 375–450 g. The problem is that most of us don't get close to the recommended amount. Rather than weighing your broccoli, a practical approach is simply to include a decent amount of vegetables in two or three meals each day.

2. If Five or Six Serves Are Good, Is More Better?

Probably, although there appears to be a point of diminishing returns. A major meta-analysis covering 95 prospective studies found progressively lower rates of cardiovascular disease and premature death as combined fruit and vegetable intake increased, with benefits observed up to around 800 g per day. Another analysis involving almost 1.9 million people found the lowest mortality around five combined servings per day, with relatively little additional association beyond that. These observational studies can't prove vegetables caused the differences, but the overall picture is reassuring: five or six serves is an excellent target, and somewhat more is perfectly reasonable — particularly if those vegetables replace highly processed or calorie-dense foods.

3. Which Vegetables?

Rather than searching for one “super vegetable,” variety is probably the smarter strategy. Spinach and Silver beet provide a different nutrient profile from carrots and pumpkin; broccoli, cabbage and cauliflower give us the cruciferous family; tomatoes and capsicum provide another collection of phytochemicals; while beans and lentils contribute fibre and protein. Research has found particularly favourable health associations with green leafy and cruciferous vegetables. An easy rule is simply to eat different colours and types across the week. You don't need twelve different vegetables every day.

4. Seasonal, Local and Fresh — Does It Matter?

As we discovered in our previous article, a vegetable being sold as “fresh” doesn't tell us when it was harvested. Some nutrients gradually decline after picking, so locally grown produce eaten relatively soon after harvest has an advantage. There's also a simpler reason for buying seasonally: it generally tastes better. Beautiful fresh tomatoes or peas need little encouragement to eat. But don't turn seasonal eating into a religion. Frozen vegetables remain extremely nutritious, while canned tomatoes, beans and legumes are convenient and useful. The priority should be eating plenty of vegetables first and worrying about perfection second.

5. What If You Hate Vegetables?

This is where nutritional theory meets reality. Instead of forcing down vegetables you hate, hide them in foods you already enjoy. Grate carrot and zucchini into Bolognese, blend pumpkin or capsicum into pasta sauce, add mushrooms and vegetables to burger patties, spinach to omelettes, frozen vegetables to fried rice or cauliflower to mashed potato. Soups are another easy option because almost everything can disappear into the blender. Preparation also dramatically changes flavour: someone who hates boiled Brussels sprouts might genuinely enjoy them roasted until browned and crispy. Start small and gradually increase the amount.

6. Does It Matter When We Eat Them?

There's no reason to think broccoli becomes magically healthier at 6 pm, but timing can indirectly affect what else we eat. Dinner is particularly useful. If half your plate is vegetables or salad, there's less room for chips, pasta, rice and other calorie-dense foods. Replacing a large evening serving of these foods with broccoli, beans, cauliflower, zucchini or carrots can substantially reduce both carbohydrate and total calorie intake, which may help with fat loss. But it's the substitution and lower energy intake doing the work, not a special night-time effect. Someone training hard may actually benefit from having more carbohydrate with dinner, so the meal should match the person's goals.

The Big Picture

For most adults, five to six serves — roughly 375–450 g of vegetables per day — is an excellent target. Eating somewhat more may offer additional benefits, especially when vegetables replace less nutritious, calorie-dense foods. Mix up the colours, enjoy seasonal local produce when it's available and keep frozen vegetables handy when it isn't.

Most importantly, find ways of eating vegetables that you actually enjoy. Roast them, grill them, spice them, put them in curries and soups, or hide them in meals if necessary.

The best vegetables aren't necessarily the fashionable ones. They're the ones that regularly make it from your shopping basket onto your plate.