Many people don’t eat enough fruit and vegetables, and at a population level we seem to score under par. However, I’ve noticed an interesting seasonal trend with some of my clients over summer. One where if they tend to be prone to metabolic issues like weight gain and blood sugar control these tend to spike; and the common thread is fruit.
This got me to investigate, how much fruit should you eat? Is there such thing as consuming too much, and if so, what is it?
How much fruit according to the Australian Dietary Guidelines
Now back in the 2000s there was a relatively successful campaign called “Go for 2 and 5” which educated us on the Australian Dietary Guidelines. This tells us how much fruit and vegetable we should be consuming. The evidence seems to show that as a population we should be aiming for 2 serves of fruit and 5 serves of vegetables per day.
We know that it was a successful campaign, as over the campaign period the awareness of these ads went from 20% to 70% of survey respondents (Department of Health & Ageing, 2007). Interesting though, while 94% of respondents were able to correctively give the fruit consumption guidelines of 2 or more serves per day, only 32% correctly gave the correct response of 5 or more serves of vegetables.
This got me thinking. Do we have a confirmation bias when it comes to fruit and vegetable consumption? By this I mean that we tend to hear the message that we should be eating more of the lovely sweet stuff. But ignore the message regarding boring old vegetables.
Perhaps we thought the message was go for 5 and 2 rather than 2 and 5?
So does excessive fruit consumption matter to our health?
At least if we look at the report published on the success of the Go for 2 and 5 campaign we see that people were already consuming the guidelines of two serves of fruit per day on average. While the average serves of vegetables scraped in at just over half of the guideline at 2.6 serves. Interestingly, while we already succeeded as a nation at consuming 2 serves of fruit 43% indicated that they planned on increasing their fruit consumption. Only 28% planned on increasing their vegetables.
Certainly this appears as though the message of eating more fruit was much more palatable to survey respondents.
So it doesn’t surprise me then when I see a dramatic spike in how much fruit some of my clients eat over summer. This amount for some was up to 5-10 serves per day. Now clinically we saw increases in 1-2 kg of weight and spikes in blood sugar levels, even though these clients were doing what they thought was best for their health. They have listened to part of the message (the part which is most palatable for us sweet tooths!) and simply didn’t consider that you might be able to have too much fruit!
In summer we tend to have an explosion of seasonal fruit to the market. Stone fruits, melons, and tropical fruits all tend to hit our grocery stores at a cheaper price. Interestingly, all of my clients who have drastically increased their consumption of fruits over summer had a stone fruit tree such as peaches and nectarines in their backyard.
So how much fruit should you eat per day?
Well that depends on what you may want to prevent health wise, but somewhere between 2-3 serves per day seems to be the “sweet spot”. If you want to know the science to this conclusion, and what fruits tend to work best for you, please read part two of this blog!
About the author
So we established in Part 1 of this blog that the guidelines suggest that two or more serves is how much fruit we should consume. However, for some of us, it’s really easy to over consume. And this may well be having a negative impact on our health. Now I finished the previous blog with suggesting that somewhere between 2 to 3 serves is most ideal. But what if I have metabolic issues? Are there better and worse fruits to consume?
How much fruit should I consume to protect the heart?
Interestingly, many studies have looked into this question. However, they tend to combine fruit and vegetables together making it hard to conclude. One study by Lai et al (2015) looked into this and found that in a group of UK women the risk of death from a cardiovascular event decreased with more fruit even with over 4 serves per day. It’s would be easy from this to conclude that more is better right?
Another UK study looked at the risk of death from cardiovascular disease or cancer in both men and women (Oyebode et al 2013). What they found was that increased vegetable consumption was more protective than fruit. When they looked at just fruit intake the greatest benefit was at 3 serves per day. Depending on the model used, an increase in serves beyond this either had no further benefit or increased your risk.
How much fruit should I eat for metabolic health?
So we know that 3-4 serves of fruit is good for the heart. But what about people who are at risk of or want to prevent diabetes?
We have a good amount of evidence here that perhaps we shouldn’t be eating too much fruit. In fact a very large meta-analysis of 7 studies by Li et al (2015) concluded that those who had a fruit intake of around 200 grams per day (about 1.5 serves) were less at risk of developing diabetes. While it certainly is not good to have no fruit in a day, having 3-4 serves increased your risk comparatively. And from there, things tended to get worse with increased fruit consumption.
Furthermore, a study by Zhang & Jiang (2015) tended to corroborate this finding with two serves a day being the “sweet spot” for reducing the risk of developing diabetes in a study of over 200,000 individuals. And similar to the Li et al (2015) meta-analysis, they found a similar U shaped curve when consumption increased above 2 serves with 4 serves being as high a risk as having no fruit at all.
So there may be such thing as too much of a good thing. And like most things we need to consume fruit in moderation, especially if we’re at risk of diabetes and metabolic conditions.
But are some fruits better than others? Well the short answer to this question is “yes”
Fruits that when you consume more to have a health benefit
Interestingly, most studies will show that vegetables have a stronger association in reducing premature death than fruit (Oyebode et al 2013). However, some fruits, when you consume more tend to reduce your risk of either cardiovascular disease or diabetes.
Lai et al (2015) found that a greater intake of citrus was associated with a lower risk of fatal stroke in women. While grapes were seen to be more protective against a fatal cardiovascular event. When we look at the risk of diabetes, Alperet et al (2017) found that temperate fruit such as apples was associated with a loser risk of diabetes in women. Both citrus and grapes tended to lower the risk of diabetes for both men and women.
So it appears there are some common threads: citrus and grapes tend to reduce our risk. But what about fruits that perhaps aren’t so good for us to overconsume?
Fruits that may not be good for us when we over consume
Firstly, a common theme in most studies is that fruit juice is not fruit! Imamura et al (2015) found that while not quite as bad as soft drink (every serve a day increased your risk of diabetes by 18%), every serve of fruit juice increased your risk by 5%.
When it comes to increasing your risk of cardiovascular disease it seems that any canned fruit will do this (Oyebode et al, 2013). They found that every daily serve increased your risk by 17%.
Now there it appears that too much tropical fruits (bananas, mangoes, melons) will increase your risk of diabetes and these should be limited to less than one serve a day (Alperet et al 2017). Interesting Huang et al (2017) found that tropical fruit increased the risk of gestational diabetes.
Finally, Alperet et al (2017) also found that higher glycaemic index (GI) fruits had a greater risk than lower GI fruits. While these fruits tend to be more tropical in nature here’s a list of fruits with a GI greater than 50:
- Watermelon – 72
- Pineapple – 66
- Rock melon – 65
- Paw Paw – 60
- Canned Peaches – 58
- Banana – 56 (although increases with ripeness)
- Kiwi Fruit – 52
The take home message about how much fruit you should eat
- The amount of fruit you eat is important. 2-3 serves per day is probably best for your long term health but more than 4 may increase your your risk of metabolic conditions such as diabetes.
- Try and limit your consumption of high glycaemic fruits like tropical fruits and treat them as “treats”.
- Don’t count fruit juice as a fruit, if anything it should be treated more like soft drink
- Aim to get the bulk of your 2-3 serves of fruit a day from lower or moderate GI fruits. Fruits like grapes, apples and citrus all appear to reduce your risk of health conditions as you age.
About the author
Let’s start with hard facts:
Physical inactivity is the fourth leading cause of death due to non-communicable disease (heart disease, stroke, diabetes and cancers) worldwide – contributing to over three million preventable deaths annually.
Nearly one in three (29.7%) adults are insufficiently active (less than 150 minutes of physical activity per week), while 14.8% are inactive (no exercise in the last week).
We know exercise is good for us! Even if we don’t really know how or why – we all know it’s good for us, it’s almost in innate knowledge. So why aren’t more of us exercising?! I think it’s fairly safe to say our motivation to exercise is a pretty universal barrier for most of us, so let’s talk about that.
Motivation to Exercise and the F Word
I’m going to go a bit left field here, stick with me… I’ve just finished reading Mark Manson’s book and a lot of what he said resonated with me not just in life, but particularly toward our motivation to exercise.
Failure is a relative concept. It totally depends on how we’re choosing to measure our success towards our goals. And our goals should be driven by our values.
The Link Between Our Values & Motivation to Exercise
Sometimes, where we go wrong is that our values aren’t quite right to help foster a positive, successful experience that builds self-efficacy and growth.
For instance, if I measure my effort at the gym by “do I look like Jennifer Aniston yet?”, I will be self-critical and negative as this is something I don’t really have control over. We have different genetics, different body types, enjoy different types of exercise, have different time constraints (the list goes on). But if I adopt the metric “maintain a regular and consistent exercise routine”, I can live up to my value of “Live a healthy, balanced life”.
Toddlers learning to walk continually fail. They stand up, take half a step, wobble, fall over, and repeat that cycle a few thousand times before they can actually walk. Never do they think “my god, I suck at this, I don’t think walking is for me!”.
However, improvement on anything is based on thousands of tiny failures. And the magnitude of your success is based on how many times you’ve failed at something. If someone is better than you at something, then it’s likely because they have failed at it more than you have. (Or done it many more times, and therefore have refined the skill and have the capacity to do it better!)
Important note: Pain is part of the process! (mentally and physically). You can’t make a muscle without tearing a few fibers!
For most of us, our proudest achievements come in the face of our greatest adversity. I know that when I’m feeling lazy and I squat 20kg I feel alright…but when I manage to push myself and squat 55kg (closer to my 1RM), I feel like I just earnt athlete status! This usually involves some stern positive self-talk at the time, and some muscle soreness the next day. Neither are comfortable, but both build resilience, strength and capacity. Both also build my motivation to exercise!
The “just do SOMETHING” Principle
To come full circle; action isn’t just the effect of motivation; it is also the cause of it.
Most of us only commit to action if we feel a certain level of motivation. And we feel motivation only when we feel enough emotional inspiration. We assume it’s a chain reaction.
The thing is, it’s not a chain, it’s an endless loop.
If we start doing something, this sparks inspiration, and then before we know it, we have motivation, and so we keep doing that thing (all the while, improving and feeling more confident) and then we feel inspired to challenge ourselves a little further, and look at that – more motivation!
Tim Ferris (American author) spoke of a story he once heard about a novelist who wrote over seventy novels. Someone asked how he was able to write so consistently and remain inspired and motivated. He replied, “two hundred crappy words per day, that’s it.”
The idea was that if he forced himself to write two hundred crappy words, more often than not, the act of writing would inspire him; and before he knew it, he’d have thousands of words down on the page.
Take home messages to improve your motivation to exercise:
- Pick small, achievable tasks or challenges
- Do SOMETHING. Something is better than nothing! (and it breeds motivation to do more)
- Make sure the way you’re measuring your success comes down to your actions and input (not other, external factors)
About the Author
Exercise and anxiety have a bit in common. They both cause increased heart rate and breathing. They both make you sweaty. And you can’t seem to think of much else at the time!
A little on anxiety…
Anxiety is something we all feel, at some point, in some way or another. It may look and feel slightly different for everyone! It’s a natural reaction to a ‘threat’ that happens at a certain point in our bodies stress response. When the sympathetic nervous system and the hypothalamic-pituitary-adrenal (HPA) axis shift into high gear (you may remember I touched on this in my last blog!).
When you’re preparing for a speech, this is great – because it sharpens your attention so you can rise to the challenge. Completely normal. But if you worry when there’s no real threat, to the point where you can’t function normally, that’s an anxiety disorder.
18% of the population suffers from a clinical anxiety disorder.
A study done in 2004 looked at 54 sedentary college students with generalized anxiety disorder. Split into two groups, one group ran on treadmills at 60-90% of their maximum heart rate. The second group walked. Whilst both groups showed reduced anxiety levels, the rigorous exercise worked more quickly and effectively. Furthermore, students in this group reported less fear of the physical symptoms of anxiety.
So here’s the theory:
When we raise our heart rate and our breathing in the context of exercise, we learn that these physical signs don’t necessarily lead to an anxiety attack. We become more comfortable with our body being aroused, and we don’t automatically assume that the arousal is noxious.
We use exercise to combat the symptoms of anxiety, and thus treat the state. While your level of fitness improves, you chip away at the anxiety trait. Over time, you teach the brain that the symptoms don’t always spell doom and that you can survive. You’re reprogramming the cognitive misinterpretation.
A match made in physiological heaven
How does exercise do this?
As we start using our muscles, the body breaks down fat molecules in the blood stream to fuel them. These free fatty acids compete with tryptophan to catch a ride on our transport proteins, elevating its concentration in the blood stream.
To equalize its levels, tryptophan pushes through the blood brain barrier, and is used as a building block for our old friend serotonin (feel good hormone).
BDNF, which is also released with exercise, also increases levels of serotonin, which enhances our sense of safety.
Moving the body also triggers the release of GABA, which is the brain’s major inhibitory neurotransmitter (and the primary target for most anti-anxiety medications), which interrupts the obsessive feedback loop within the brain.
When our heart starts beating hard, its muscle cells produce a molecule called atrial natriuretic peptide. That puts the brakes on our hyper-aroused state.
Clearly there is a connection between how much you exercise, and how anxious you feel.
Scientists have shown that exercise helps the average person reduce normal feelings of anxiousness – next time you’re feeling stressed, overwhelmed, or anxious, try squeezing in 15-20 minutes of huff and puff exercise and see how you feel after. You be the judge!
Broman-Fulks, Berman & Webster (2004), ‘Effects of aerobic exercise of anxiety sensitivity‘, Journal or Behaviour Research and Therapy, vol. 42, no. 2, pp. 125-136
Ratey, John J.,Hagerman, Eric. (2008) Spark :the revolutionary new science of exercise and the brain New York : Little, Brown,
About the Author
On the back of recent iNform blogs about the positive effects of spending time in the outdoors amongst our blue and green spaces, I thought it would be great to pass on some of my favourites so that you can explore Adelaide’s trails and beaches:
Green Places (Adelaide’s trails):
You’ll find the start of the boardwalk in Hallett Cove (or you can start at the other end in Seacliff), a 35 minute drive from Adelaide. The walk itself is a 10.2km return walk rated as a moderate hike. If you aren’t up to 10.2km, it’s very easy to walk as far as you wish and turn around.
It’s a scenic walk along the cliff-tops of Marino and has numerous valleys and resultant stairs to climb. There are also several little paths in the valleys that you can explore to take you to the rugged beaches. You can find plenty of birdlife and if you’re lucky and have a good eye, some ocean life may show itself also. At the Hallett Cove end there is also a great café for lunch and or a coffee after your walk.
A little further from Adelaide at a 75 minute drive, this little gem of a trail is one of the most scenic around. The rugged cliffs and coastline of Newland Head Conservation Park provides some amazing views. The trail itself is rated moderate and is 11.5km one way. Keep this in mind as you may need someone at the other end to pick you up if you choose to do the whole one way walk. Alternatively, you can walk just a part of it and turn around.
Just a whisper away from the CBD at a 15 minute drive, Chambers Gully is Waterfall Gully’s little brother. The trail to Mt Lofty is a 15km circuit, rated hard hike with steep sections so make sure you are prepared if you are doing the full loop. If you want more of a casual walk, the first few kilometres of Chambers Gully are less strenuous and very scenic. There’s lots of wildlife to be seen if you keep your eyes open.
Blue Places (Adelaide’s beaches):
I may be a bit biased about Port Noarlunga given I spent many days there growing up. But I’ll stand by my claims that it’s a top spot. It’s a 40 minute drive from Adelaide and has numerous activities available. You can hire snorkels and fins from Elite Dive Academy and go snorkeling out at the reef. There is a jetty that will lead you out to the reef which you can also walk on and explore at low tide. If you take a short walk over to the river you can hire kayaks from Easy Kayak Rentals and have a cruisy paddle down the river. For those wanting to hit the waves, South Port Beach sits at the south end of Port Noarlunga and can often have a nice wave rolling in. Need a board? Preece’s Surf shop can help you out.
A quaint little town on the coast about a 90 minute drive from Adelaide. Great spot on a nice day for some fishing, kayaking or just a swim. Don’t miss the walk around the bottom of the cliffs to explore a little more. There are some great other little beaches and places to explore if you are willing to have a look around.
Port Willunga is a quiet little town about a 50 minute drive from Adelaide. The beach itself sits in a bay and is a little protected from the elements. There is a lot of beach to spread out on and the cliffs that overlook the beach can be quite scenic. The Star Of Greece café sits at the top of the hill, named after an iron cargo ship that wrecked here in 1888. The wreck provides a great diving spot for keen divers. Snorkeling off the beach is also very accessible.
Bonus locations for the travelers out there:
If you like to travel, Innes National park is a wonderful place to visit. There is lots of historical walks, shipwrecks, surf breaks and protected bays to explore. You could easily spend a week there doing walks every day and not get bored.
This is literally a hidden beach. When driving into Stokes Bay you are greeted with a rocky bay and a boat ramp. If you care to find a park and do a little searching, there is a narrow path/cave that makes its way through and under rocks, opening up to a pristine white sand beach. There is a protected wading/swimming area for the little ones and if the conditions are right there can be a fantastic little left hand beach break for the keen surfer.
These really are just a handful of quality outdoor environments the Adelaide region has to offer. When it comes down to it, if you are outdoors and moving and enjoying it, then you are in a great place. If you want to find more great trails WalkingSA has a great database of trails throughout the state.
If you want to explore Adelaide’s trails and beaches more but feel you can’t due to injury or fitness levels. Come in and see us. We can get you on track (or in the water) in no time.
About the Author
Creating sustainable behaviour change is hard. No question about it. But it can be done. If you commit to it. And I’d like to take you through a process you can follow to maintain behaviour change when you don’t feel like it!
I’d like to share with you an example of how a morning last week played out for me, when I REALLY didn’t feel like getting out to exercise. In fact, I had a bike ride planned, which I love doing by the way. But this morning in question I didn’t really feel like going for a ride… I was quite stuffed to be honest. So here is how I got over my slump:
Your 4-steps to maintain behaviour change
- I first allowed myself to reach a compromise. I would go out if I ‘allowed’ myself to go for a short ride, and at an easy pace. I’m a bit competitive, even with myself, and I know that most rides I push hard, just to beat previous efforts, and today I just didn’t have it in me! But this wasn’t enough… I was still trying to talk myself out of it!
- I then focused on the positives of the ride instead of how I was feeling; such as the sense of accomplishment I would have when back home; how much I enjoy flying down hills; how good it feels to get to the summit of a climb; and the time I would have with my own thoughts.
- Now, all these positives had to be established previously in my head, so that my brain would actually look forward to them, tipping the balance in their favour, rather than the present feeling of fatigue. In a previous blog I actually outline a process to establish a positive feeling in your brain to reinforce positive behaviours. It’s all about celebrating well earned victories, as we are subconsciously driven towards ‘rewards’ for behaviours… but have a read of that blog and try out the process for your self, in a context that applies to you at the moment. If you would like a bit of guidance, let me know by posting a comment below!
- I always leave my gear ready the night before as you can see in the featured image above. This just removes one more barrier (or excuse!). It also pretty loudly tells my family that I’m heading out for a ride, so it helps to keep me accountable externally as well. It’s a bit of a ‘walk-of-shame’ to put the bike away in the garage without having ridden it!
And here I am on the other side. Feeling great that I got out for that little spin. With one more little victory in my back pocket, that will in itself, be one of the motivations that will help me get out again when the clouds are dark…
Let me encourage you to try the process above, applied to suit your context, and I assure you that it will help you maintain behaviour change when it seems like the last thing you want to do! Please let me know how you go!
About the Author