You've probably heard foods described as "acid-forming" or "alkaline-forming", but what does that actually mean? And do you need to cut out acid-forming foods altogether?
This guide explains the idea in plain language, lists common foods in each group, and shares a simple, balanced way to apply it day to day.
What "acid-forming" and "alkaline-forming" mean
These terms describe what a food leaves behind once your body has processed it, not how acidic it tastes.
When food is digested and metabolised, it leaves behind compounds that are either more acidic or more alkaline. Scientists estimate this with a measure called PRAL (potential renal acid load). Foods with a negative PRAL are called alkaline-forming, and foods with a positive PRAL are called acid-forming.
That's why lemons, which taste sour, are actually considered alkaline-forming, while foods like cheese and meat, which don't taste acidic at all, are acid-forming.
What it doesn't mean
It's worth being clear about one thing: food doesn't change the pH of your blood. Your body keeps blood pH within a very tight range on its own, whatever you eat. What diet can influence is the pH of your urine.
So the real value of eating more alkaline-forming foods isn't about changing your body's pH. It's that these foods are mostly vegetables, fruit and other whole plant foods, which most of us don't eat enough of.
Common foods in each group
Most fruit and vegetables are alkaline-forming, while animal proteins, cheese and grains tend to be acid-forming.
Alkaline-forming
- Leafy greens (spinach, kale, lettuce)
- Most vegetables (broccoli, carrots, capsicum, cucumber)
- Potatoes and sweet potatoes
- Most fruit (bananas, berries, citrus, melon)
- Fresh herbs
- Avocado
Roughly neutral
- Most beans and legumes
- Oils (olive, avocado)
- Plain milk and yoghurt (mildly acid)
- Water
Acid-forming
- Meat and poultry
- Fish and seafood
- Eggs
- Hard cheeses
- Bread, pasta and rice
- Many processed and packaged foods
Values vary between sources and how a food is prepared, so treat these groups as a general guide rather than an exact science.
Finding balance on your plate
You don't need to cut out acid-forming foods. Many of them, like fish, eggs and legumes, are nutritious. The aim is simply to tip the balance towards plants.
- Fill half your plate with vegetables at lunch and dinner.
- Pair proteins with greens. If you're having meat, fish or eggs, add a big serve of vegetables or salad alongside.
- Snack on fruit and vegetables instead of packaged snacks.
- Start the day with greens or fruit, like a smoothie or fruit with your breakfast.
- Cut back on heavily processed foods, which tend to be acid-forming and offer less nutrition.
If you'd like some easy meals to start with, try our simple alkaline-focused recipes.