If, like myself, you’ve spent any time looking into healthy eating, chances are you’ve come across the existence of the alkaline diet. Depending on where you’re reading, it has been credited with everything from helping people lose weight to preventing disease, reducing inflammation and even slowing down ageing.
Those are some pretty big claims to say the least.
Contents
Can Food Really Change Your Body’s pH?
Does the Alkaline Diet Help Weight Loss?
When I first heard about it, I remember instantly thinking it sounded almost too good to be true. The idea is certainly appealing. Eat more of the “right” foods, avoid the “wrong” ones AND your body becomes healthier simply because it’s more alkaline.
Simple.
Except our bodies aren’t quite that simple, are they?
The alkaline diet has been around for years and still pops up regularly on social media, in celebrity interviews and across wellness blogs. I wrote about it at depth here if you’d care to take a look. The truth is, some people swear by it, while others dismiss it completely. It can be difficult to know what to believe when everyone seems to have a different opinion.
So, does the alkaline diet work?
The short answer – yes… and no.
If you’re hoping it will magically change your body’s pH or cure illnesses, the evidence sadly just isn’t there. However, if following the alkaline diet encourages you to eat more fruit, vegetables, legumes and minimally processed foods, then there are certainly health benefits to be had.
The important thing is understanding why those benefits happen.
Keep reading, and I’ll explain what the alkaline diet actually is, where the theory comes from, what the scientific evidence says and whether it’s something I’d recommend if your goal is sustainable weight loss.
As always, before undertaking any kind of weight loss or lifestyle change, it is always best to speak to a medical professional or registered dietician who is best suited to give personalised advice on your individual health needs and health issues. This blog post has been researched to the best of my ability, and the information posted is accurate at the time of publication. Soph-obsessed is not affiliated in any way with any weight loss plan.
What Is the Alkaline Diet?
The alkaline diet (sometimes called the alkaline ash diet or alkaline acid diet) is based on the idea that the foods we eat can affect the acidity or alkalinity of our bodies overall.
Before you start to panic and think you’re about to be transported back to a high school chemistry lesson, it’s actually a fairly simple concept, don’t worry.
Everything is measured on something called the pH scale, which runs from 0 to 14. You might remeber this from year 7 science class!
- A pH below 7 is considered acidic.
- A pH of 7 is neutral.
- A pH above 7 is alkaline (sometimes called basic).
Supporters of the alkaline diet believe that eating too many “acid-forming” foods can make your body more acidic, increasing your risk of weight gain and illness. On the other hand, they believe that choosing more alkaline-forming foods helps restore balance and improves your health overall.
The diet doesn’t suggest that foods themselves are acidic or alkaline when you eat them. Instead, it’s based on the theory that once food has been digested and metabolised, it leaves behind an “ash” that is either acidic or alkaline. According to the diet, foods are generally divided into two groups:
Foods encouraged on the alkaline diet
The foods considered alkaline-forming include:
- Most vegetables
- Most fruits
- Potatoes and sweet potatoes
- Nuts and seeds
- Beans, lentils and chickpeas
- Herbs and spices
- Tofu and some other plant-based proteins
Foods that are limited
Foods believed to be acid-forming include:
- Red meat
- Chicken
- Fish
- Eggs
- Dairy products
- White bread
- Pasta
- Rice
- Sugary foods
- Processed foods
- Fizzy drinks
- Alcohol
- Coffee
As you can probably imagine, that list makes the alkaline diet look very similar to many other healthy eating plans. It encourages plenty of fruit and vegetables while limiting highly processed foods and sugary snacks. At first glance, it can actually sound pretty sensible and make some sense.
But this is where things become a little more complicated and complex.
The biggest claim behind the alkaline diet isn’t simply that eating more vegetables is good for you. Most nutrition experts would agree with that, right?
The real claim is that these foods can change your body’s pH and that this is responsible for the health benefits.
That’s the part we need to take a closer look at.
Can Food Really Change Your Body’s pH?
This is where the evidence for the alkaline diet starts to fall apart. The central idea behind the diet is that the foods you eat can make your body either more acidic or more alkaline. It sounds believable because we know that different foods have different levels of acidity. Lemons are acidic. Vinegar is acidic. Some foods are naturally more alkaline.
But the reality is…
Your body works incredibly hard to keep your blood pH within an extremely small range of around 7.35 to 7.45. If it drifts much outside that range, it starts to become a medical emergency.
Thankfully, our bodies have several systems working around the clock to stop that from happening.
Your lungs help to regulate the carbon dioxide levels, while your kidneys constantly remove excess acids and bases through your urine. Together, they keep your blood pH remarkably stable without you having to think much about it at all.
That’s why eating a steak doesn’t suddenly make your blood acidic, and eating a plate of spinach doesn’t make it alkaline. If food really could dramatically change your blood pH, we’d all be in serious trouble after every meal passes our lips.
So where does this confusion come from?
One reason is that your urine pH can change depending on what you eat. If you follow an alkaline diet, your urine may become more alkaline. Some people mistake this as proof that their whole body has become more alkaline. In reality, it’s actually evidence that your kidneys are doing exactly what they’re supposed to do: removing excess substances while keeping your blood pH stable!
This is sadly one of the biggest misconceptions surrounding the alkaline diet. That doesn’t mean the foods recommended by the diet are unhealthy or they don’t have an incredible benefit. Quite the opposite in fact. Eating more vegetables, fruit, legumes and whole foods is something most of us could benefit from.
It’s just that the benefits come from the nutrients, fibre and overall quality of those foods, not because they’ve changed the pH of your blood!
That’s an important distinction to make.
When scientists have looked at the evidence, they haven’t found convincing proof that changing your diet can meaningfully alter blood pH in healthy people. Instead, the body maintains that balance incredibly well all on its own. So while the theory behind the alkaline diet sounds logical at first, it doesn’t stand up particularly well when we look at how the human body actually works.
Does the Alkaline Diet Help Weight Loss?
This is where things can get interesting.
If you’ve read stories from people saying they lost weight on the alkaline diet, they’re probably telling the truth. Plenty of people do lose weight while following it. The question is whether they lost weight because the diet made their body more alkaline.
The evidence for this would suggest no.
Weight loss almost always comes down to one fundamental principle: consuming fewer calories than your body burns over time. That’s known as a calorie deficit, and it’s the driving force behind fat loss regardless of whether you’re following the alkaline diet, Mediterranean diet, low-carb diet or something else entirely. If you are losing weight, it is because you are in a calorie deficit!
So why does the alkaline diet seem to work so well for some people?
The answer is surprisingly simple.
When you cut back on the heavily processed foods, sugary snacks, takeaway meals and high-calorie drinks, you’re often reducing your calorie intake without even trying. At the same time, you’re filling your plate with foods that are naturally lower in calories but higher in fibre and water, such as vegetables, fruit and beans.
Those foods can help you feel fuller for longer, making it easier to eat less overall. For many people, that’s enough to create a calorie deficit and lose weight.
The problem is that the weight loss gets credited to the diet’s claims about changing your body’s pH, when in reality it’s far more likely to be the result of eating a healthier, lower-calorie diet. This is something I see quite often in the world of weight loss.
People follow a particular diet, lose weight and naturally assume it was because of the unique rules of that diet. In reality, many successful diets have one thing in common: they help people eat fewer calories in a way that feels manageable for them. And that is ultimately what successful weight loss is about.
That’s why you’ll find people who have lost weight on everything from intermittent fasting to low-carb diets, Slimming World, replacement plans. and everything in between.
The method in each plan may be different, but the reason the weight comes off is usually the same. Even for those on GLP-1 medications like Mounjaro or peptides like Retatrutide.
Personally, I don’t believe you need to avoid perfectly healthy foods simply because they’re labelled as “acid-forming”. Lean chicken, fish, eggs and dairy can all be part of a balanced diet and provide important nutrients, especially protein, which plays a big role in helping you feel satisfied and maintain muscle while losing weight.
If following the alkaline diet helps you eat more vegetables and fewer ultra-processed foods, that’s a positive step. But if it’s making you fear certain foods because of unsupported claims about acidity, that’s where I think it becomes unnecessarily restrictive.
I’ve lost over 7 stone and researched every inch of the weight loss industry, and from my experience, the best diet isn’t the one with the most complicated rules. It’s the one you can realistically stick to for months and years, not just a few weeks!
What Does the Research Say?
Whenever a new diet becomes popular, one of the first questions I ask is, “What does the evidence actually say?” After all, it’s one thing for a diet to sound convincing or have glowing testimonials online. It’s another for it to hold up when scientists put it to the test. There are so many scams out there in the weight loss space. Finding factual evidence for any plan is essential to prevent you risking your health and wasting your money.
When it comes to the alkaline diet, the research just doesn’t support many of its biggest claims. Several reviews have looked at whether eating an alkaline diet can change the blood pH, improve bone health or prevent diseases such as cancer. So far, the evidence hasn’t shown that it can.
For example, one review published in the Journal of Environmental and Public Health concluded that there was no substantial evidence to support the idea that an alkaline diet prevents cancer or that changing the acid load of your diet provides the health benefits often claimed. Research has also challenged the long-standing belief that acidic foods “leach” calcium from your bones. In fact, the studies suggest that normal dietary acid intake doesn’t appear to increase the risk of osteoporosis in healthy people at all. That doesn’t mean every aspect of the alkaline diet is without merit.
Many of the foods it encourages are genuinely good for your health. Diets rich in fruit, vegetables, beans, nuts and whole foods have consistently been linked with a lower risk of heart disease, type 2 diabetes and other long-term health conditions, so it’s certainly not a bad thing.
But those benefits are already well established and don’t require the alkaline theory to explain them. In other words, it’s likely that people following the alkaline diet feel healthier because they’re eating more nutritious foods and fewer highly processed ones, not because they’ve altered the pH of their bodies.
I think that’s an important point to remember.
It’s easy to give credit to the latest trending diet when you start feeling better. But sometimes the simplest explanation is the correct one. If you’ve gone from eating lots of takeaways, sugary drinks and processed snacks to filling your plate with vegetables, fruit and home-cooked meals, your health is probably going to improve.
Not because your body has become more alkaline. But because you’ve started giving it better-quality fuel! For me, that’s the biggest takeaway from the research.
You don’t need to worry about whether a banana is alkaline or whether a piece of chicken is acid-forming. Your body is perfectly capable of regulating its own pH. Instead, focus on building meals around nutritious foods you genuinely enjoy, eating enough protein, getting plenty of fibre and creating habits you can stick with for the long term. That’s far more likely to improve your health than chasing a diet based on a theory that science hasn’t been able to support.
Are There Any Benefits?
Despite everything we’ve covered so far, I really don’t think it’s fair to dismiss the alkaline diet completely. While I don’t necessarily believe the theory behind it is supported by strong scientific evidence, many of the habits it encourages are genuinely positive, and that cannot be dismissed.
For a lot of people, following the alkaline diet means eating more vegetables than they normally would. It often leads to more fruit, beans, lentils, nuts and home-cooked meals making their way onto the plate too. Those are all things I’d encourage regardless of what you call your way of eating.
Fruit and vegetables are packed with vitamins, minerals, fibre and antioxidants. Fibre can help keep you fuller for longer, support your gut health and make it easier to manage your appetite. Swapping heavily processed foods for whole foods can also improve the overall quality of your diet.
Some people also find that simply having a structure to follow helps them make healthier choices. If the alkaline diet gives someone the motivation to cook more from scratch, eat fewer takeaways and think more about what they’re putting into their body, that’s certainly not a bad thing. Each to their own.
However, I think it’s important to separate the healthy habits from the health claims. You don’t need to believe that broccoli changes your blood pH in order to benefit from eating it. Likewise, you don’t need to avoid every so-called acid-forming food to be healthy.
In fact, some of the foods that are limited on the alkaline diet are incredibly nutritious. Lean chicken, fish, eggs, Greek yoghurt and other dairy products are excellent sources of protein, vitamins and minerals. For many people, they can be part of a balanced diet that supports both good health and sustainable weight loss.
Personally, I prefer to focus on balance rather than strict rules. That is how I have lost over 7 stone and maintained it long term. For me, sustainability will always beat perfection. If the alkaline diet encourages you to eat more vegetables, brilliant. Keep doing that.
But don’t feel like you have to avoid foods that nourish your body simply because they’ve been labelled as “acid-forming”. When we look at the evidence, there’s little reason to fear them.
Are There Any Downsides?
Like most diets that come with a long list of rules, the alkaline diet isn’t without its drawbacks. The biggest one, in my opinion, is that it encourages people to avoid foods that are perfectly healthy as part of a balanced lifestyle. Foods like eggs, lean meat, fish, dairy and wholegrains are often labelled as “acid-forming”, which can make people feel as though they should limit or avoid them altogether. It may even create a bad relationship and a stigma that these foods are ‘bad.’ The problem is that these foods actually provide valuable nutrients, including protein, calcium, iron, vitamin B12 and omega-3 fats, depending on what you’re eating.
There’s simply no convincing evidence that they’re harmful because of the effect they supposedly have on your body’s pH. Another downside is that the diet can become unnecessarily restrictive. Once you start categorising foods as “good” and “bad”, eating can quickly become more stressful than enjoyable. You might find yourself avoiding meals out, worrying about ingredients or feeling guilty for eating something that doesn’t fit the rules.
I’ve been there with dieting.
After years of trying different plans, I know how exhausting it can be when food starts to feel like a maths equation or a moral test instead of something that fuels your body and brings you enjoyment.
For me, that’s one of the biggest reasons I don’t like diets that rely on strict food rules and frameworks. They’re often difficult to maintain in the long term. There’s also the cost to think about. Some versions of the alkaline diet encourage expensive supplements, alkaline water or specialist products that promise to make your body more alkaline – with little evidence or proof.
Your body already has highly effective systems in place to regulate its pH, and no expensive bottle of water is going to replace the job your lungs and kidneys are doing every second of the day. Diets with rigid rules can sometimes distract us from what really matters. Instead of focusing on eating enough protein, getting more fibre, moving your body, sleeping well and creating a calorie deficit if weight loss is your goal, it’s easy to become fixated on whether a particular food is considered acidic or alkaline.
Personally, I think that’s putting your energy into the wrong place.
Healthy eating doesn’t need to be complicated. You don’t have to memorise lists of alkaline foods or worry that eating a jacket potato with chicken instead of beans is somehow undoing your progress. The habits that make the biggest difference are often the least glamorous. Eating mostly whole foods, staying active, drinking enough water, getting enough sleep and being consistent over time might not sound exciting, but they’re backed by far more evidence than most trendy diets ever will be.
Should You Try It?
So, does the alkaline diet work? In my opinion, it really depends on what you mean by “work”. If you’re asking whether it can change your body’s pH, cure disease or deliver the kinds of health claims you sometimes see online, the evidence simply doesn’t support that. Your body is incredibly good at regulating its own pH, and thankfully, it doesn’t need us to do that job for it.
If, however, following the alkaline diet helps you eat more vegetables, more fruit, more beans and fewer ultra-processed foods, then yes, you may well notice improvements in your health. You might have more energy, eat more fibre and even lose weight. But those benefits aren’t unique to the alkaline diet. They’re the result of eating a healthier, more balanced diet overall.
Personally, I don’t think you need to avoid foods like lean meat, eggs, fish or dairy simply because they’re described as “acid-forming”. These foods can all have a place in a healthy diet and provide nutrients that many of us need. If your goal is weight loss, I’d encourage you to focus on the things we know make the biggest difference:
- Creating a sustainable calorie deficit.
- Eating enough protein to help keep you full and support your muscles.
- Including plenty of fruit and vegetables.
- Choosing foods you genuinely enjoy.
- Building habits you can stick to for the long term.
That might not be as exciting as following the latest diet trend, but it’s a strategy that’s far more likely to still be working for you six months or even six years from now. After losing seven stone myself, one thing has become very clear to me. There isn’t one magical diet that works for everyone. If there were, there would be no point in all the plans, fads and scams that pop up.
There isn’t one food that burns fat or one food that makes you gain weight overnight.
What matters most is consistency.
If the alkaline diet helps you eat more nutritious foods without making you fearful of perfectly healthy ones, then there are certainly lessons worth taking from it.
But if you’re looking for a magic solution that changes your body’s chemistry and melts away fat, I’m afraid this isn’t it.
Sometimes the most effective approach is also the simplest.
Eat mostly nutritious foods.
Move your body regularly.
Create habits you can maintain.
And don’t underestimate just how much those small, consistent choices can add up over time.
Frequently Asked Questions
Does the alkaline diet really work?
It depends on what you mean by “work”. If your goal is to eat more fruit, vegetables and whole foods, the alkaline diet may help you improve your eating habits. However, there is no strong scientific evidence that it changes your body’s pH or provides the health benefits often claimed.
Can the alkaline diet help you lose weight?
Yes, some people do lose weight on the alkaline diet. However, this is most likely because they’re eating fewer calories, more fibre-rich foods and fewer highly processed foods rather than because the diet is making their body more alkaline.
Can food change your body’s pH?
In healthy people, no. Your lungs and kidneys work continuously to keep your blood pH within a very narrow range. While your urine may become more acidic or alkaline depending on what you eat, your blood pH remains tightly regulated.
Is the alkaline diet backed by science?
The current evidence doesn’t support the idea that the alkaline diet changes blood pH or prevents diseases such as cancer. However, many of the foods it recommends are recognised as part of a healthy, balanced diet.
Are acidic foods bad for you?
Not at all. Foods such as lean meat, fish, eggs, dairy and wholegrains are often described as acid-forming, but they provide valuable nutrients and can absolutely be part of a healthy diet.
What foods are considered alkaline?
The alkaline diet encourages foods such as vegetables, fruit, beans, lentils, nuts, seeds and herbs. These foods are rich in vitamins, minerals and fibre and are generally encouraged as part of a healthy eating pattern.
Should I drink alkaline water?
At the moment, there isn’t strong evidence that alkaline water provides significant health benefits for most healthy people. Drinking enough water throughout the day is far more important than worrying about its pH.
Is the alkaline diet safe?
For most healthy adults, eating more fruit and vegetables is unlikely to be harmful. However, cutting out entire food groups without good reason can make it more difficult to get all the nutrients your body needs. If you have a medical condition, it’s always worth speaking to your GP or a registered dietitian before making major changes to your diet.
What’s the biggest myth about the alkaline diet?
The biggest myth is that food can dramatically change the pH of your blood. In reality, your body regulates blood pH very closely, regardless of what you eat.
What’s a better approach than the alkaline diet?
Rather than focusing on whether foods are acidic or alkaline, I believe it’s more helpful to concentrate on eating a balanced diet that’s rich in whole foods, getting enough protein and fibre, staying active and, if your goal is weight loss, creating a sustainable calorie deficit. These are the habits that are consistently supported by scientific evidence.
References
- Fenton TR, Huang T. Systematic review of the association between dietary acid load, alkaline water and cancer. Journal of Environmental and Public Health. 2016.
- Schwalfenberg GK. The Alkaline Diet: Is There Evidence That an Alkaline pH Diet Benefits Health? Journal of Environmental and Public Health. 2012.
- American Institute for Cancer Research. The Alkaline Diet: What You Need to Know.
- National Health Service guidance on healthy eating and balanced diets.
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