Fitness
Doctors Reveal Whether You Really Need To Exercise To Lose Weight
It’s been a hotly debated topic for years: Is focusing on your diet or your workout regimen better when you’re trying to lose weight? While research over time has generally found that dietary changes will have a larger impact on your weight than exercise alone, health experts still stress the importance of exercise in a holistic weight loss program—and here’s why.
On its own, “exercise is not a very effective tool for weight loss,” says Alexandra Sowa, MD, an internal medicine doctor specializing in preventative health, nutrition, and obesity medicine and the author of the forthcoming book The Ozempic Revolution. “But exercise is still important for cardiovascular health, overall longevity, and cognitive health.”
To simplify things, Mir Ali, MD, the medical director of MemorialCare Surgical Weight Loss Center at Orange Coast Medical Center in Fountain Valley, California, says to consider this comparison: A 155-pound adult will burn about 200 calories doing a 30-minute low-impact aerobics class. A tall Starbucks mocha is nearly 300 calories. Based on the math alone, you’d have more impact on your weight loss efforts—and save more time—by simply skipping the mocha.
Research has had similar conclusions. One scientific review concluded that doing consistent moderate-intensity aerobic exercise, like walking for 30 minutes a day, five days a week, likely won’t lead to any significant weight loss in most people without dietary changes. Another older scientific analysis of six studies in the Journal of the Academy of Nutrition and Dietetics found that people who focused on diet and exercise to lose weight didn’t end up dropping more pounds in a six-month period than people who solely altered their diet.
Exercise isn’t completely meaningless when it comes to weight loss, though.
In fact, some data suggest that a combination of dietary changes and exercise is superior to help you drop pounds. “The majority of weight loss involves diet, but exercise plays a role,” says Dr. Ali. “It can help support weight loss, and maintain your metabolism.” But if you don’t tweak your diet first and foremost, you likely won’t see notable results, he notes.
Also, exercise may make more of a difference in your waistline over the long term. That same study in the Journal of the Academy of Nutrition and Dietetics that found exercisers and dieters lost similar amounts of weight after six months did determine that people who focused on combining diet and physical activity lost more weight over a year than interventions based on diet or physical activity alone.
Working out beyond what’s recommended may have an impact, too. One study found that people who burned at least 400 to 500 calories a workout, five or more days a week, experienced weight loss without nutrition interventions. That’s why you may notice that you slim down if you’re, say, training for a half marathon or distance bike race.
Exercise can also help prevent weight gain and support weight maintenance once you reach your goal weight, Dr. Sowa says. That’s why she suggests that her patients “get into the habit of exercise to maintain weight loss and improve long-term health.”
Meet the experts: Mir Ali, MD, is the medical director of MemorialCare Surgical Weight Loss Center at Orange Coast Medical Center in Fountain Valley, California. Michael Snyder, MD, is the director of the Denver Center for Weight Loss and Bariatric Surgery Foundation and a medical advisory team member at FuturHealth. Alexandra Sowa, MD, is an internal medicine doctor specializing in preventative health, nutrition, and obesity medicine and the author of the forthcoming book The Ozempic Revolution.
Whether strength training is more impactful for weight loss than cardio is still up for debate.
Strength training is generally seen as a wise move because it helps to build muscle mass. The more muscle you have, the harder your body works at rest to burn calories, Dr. Ali explains. It’s also important to focus on increasing muscle mass as you lose weight because your body tends to lose lean muscle mass along with fat. Not only can that mess with your overall strength, it can also lower your metabolism, so you end up not burning as many calories at rest as you did in the past, Dr. Ali adds.
Of course, exercise of any sort still burns calories, and that shouldn’t be minimized. “But exercise can also increase feelings of hunger,” Dr. Ali notes. So, if you’re not being mindful of your diet while working out, you may end up taking in the same amount of calories that you burned during your workout or even more.
When paired with nutrition changes, a workout regimen that prioritizes resistance training and includes some aerobic activity is the sweet spot for weight loss.
Something else to consider: Doctors who prescribe weight loss medications usually recommend that you don’t go overboard with cardio when you’re taking something like Ozempic. Among other things, the medications tend to lower your blood sugar and exercise has a similar impact. Having blood sugar that’s too low raises your risk of uncomfortable symptoms like a rapid heartbeat, shaking, and feeling weak. “If you overdo it with aerobic exercise, it can lower your sugar further,” Dr. Ali says. “However, the point of excessiveness is different for each person.” Meaning, some cardio is probably fine. But training for a marathon while taking Ozempic may be something to discuss and plan for with your physician.
One 2022 scientific review published in the journal Obesity Reviews found that a mix of resistance training and calorie restriction was the most effective at reducing body fat compared to these interventions on their own. However, the researchers also found that a combination of resistance training and aerobic exercise also lead to “significant results.” Worth noting: Resistance training alone was also the most effective for increasing lean mass.
A 2021 analysis of 12 reviews and 149 studies also found that aerobic exercise and HIIT workouts were effective at weight management, while resistance training helped lower the odds of lean muscle mass loss while people lost weight. “These findings show favorable effects of exercise training on weight loss and body composition changes in adults with overweight or obesity,” the researchers concluded.
How To Lose Weight Effectively—Beyond Your Exercise Routine
Doctors recommend these tips whether you’re losing weight with or without medical intervention (say, with the help of a weight loss medication). Experimenting with all of the tips below can help you achieve noticeable and lasting weight loss results—and complement a workout plan too.
1. Prioritize protein.
Everyone should be eating protein, but Dr. Sowa says it’s “very, very important” when you’re on a weight loss journey. “It’s satiating and fills you up,” she says. Protein also helps to prevent muscle loss as you lose weight—a common issue—and to improve your muscle mass, she says.
Everyone’s protein needs are slightly different, but the bare minimum recommendation is 0.35 grams of protein per pound of body weight every day if you’re not active, according to The Academy of Nutrition and Dietetics. But many doctors say you’ll likely need more, especially if you’re active and strength training. That can put you more at something like 0.73 to 1 grams of protein per pound of body weight (or about 30 to 35 grams of protein per meal), per the National Academy of Sports Medicine.
2. Ramp up your fiber intake.
Fiber has a lot going for it. “Fiber slows digestion, keeps you feeling full, and helps regulate blood sugar levels,” says Michael Snyder, MD, director of the Denver Center for Weight Loss and Bariatric Surgery Foundation and medical advisory team member at FuturHealth. That translates to you feeling fuller, longer after meals and makes it less likely you’ll overeat.
The U.S. Dietary Guidelines for Americans recommend that adult women have 22 to 28 grams of fiber a day, but most Americans aren’t getting that. Consider incorporating fiber-rich foods like fruits, vegetables, whole grains, and legumes into your diet. (Just ramp up your fiber intake slowly, or you’ll end up dealing with uncomfortable bloating and gas.)
3. Get plenty of quality sleep.
Sleep hasn’t been a huge focus with weight loss in the past, but doctors swear it’s a crucial element. When you don’t get enough sleep, your body craves more energy—and that can cause you to reach for more food, Dr. Sowa says.
Dr. Snyder agrees: “Poor sleep disrupts hunger hormones, leading to overeating.”
Everyone’s sleep needs are slightly different, but it’s generally recommended that adults get seven hours of sleep or more a night.
4. Cut out sugary beverages.
Sugary drinks like sodas and sweet teas are packed with simple carbohydrates and add empty calories to your day, Dr. Ali says. If sugary drinks are a regular part of your life, “your body will use those simple carbohydrates as a fuel source rather than burning fat for fuel,” Dr. Ali explains.
These drinks can also mess with your blood sugar, which can cause you to have energy crashes, making you more prone to overeating, Dr. Snyder says.
5. Practice mindful eating habits.
It’s practically inevitable that you’ll have to eat in front of your computer at some point or that you’ll want to be entertained during dinner. But doing your best to focus on the food in front of you vs. your Instagram feed, and how your body feels while you’re eating can go a long way toward keeping you from overeating, Dr. Ali says.
Among other things, research has shown that mindful eating can help lower the risk of emotional eating. “If you’re more aware about what you’re taking in, you’re more likely to eat better,” Dr. Ali says.
6. Stay well hydrated.
Don’t sleep on the power of hydration. “Not getting enough fluids will make you feel more tired and rundown,” Dr. Ali says. Having enough fluids can also help you to feel fuller, longer and lower the odds you’ll overeat, he says.
Doctors generally recommend that you aim to have your pee be a pale yellow color—that indicates that you’re well hydrated. But if you want a more definitive guide, the U.S. National Academies of Sciences, Engineering, and Medicine recommends that women aim to have 11.5 cups (2.7 liters) of fluids a day from foods and drinks.
7. Make your stress management plan as foolproof as possible.
Some stress is inevitable in life, but being chronically frazzled isn’t great for your weight loss efforts. “Chronic stress increases stress hormone levels, which can lead to weight gain and dietary de-regulation,” Dr. Snyder says.
Research shows that stress ramps up the levels of the hunger hormone ghrelin in your body, stimulating your appetite and encouraging you to eat more than you might have if you were feeling more zen.
8. Add in plenty of vegetables at every meal.
Vegetables usually contain plenty of fiber, which is useful for weight loss, as mentioned. But Dr. Sowa notes that they’re also a great way to fill up while getting in plenty of nutrients. “Vegetables are a wonderful low-calorie, high-density food,” she says.
They can also help crowd out less healthy foods from your plate, Dr. Ali says. He just suggests focusing on high-fiber, lower starch vegetables for weight loss.
9. Swap out refined grains for whole grains.
Quick primer: Refined grains have a lot of nutrients removed and include things like white pasta and white bread. Whole grains have plenty of nutrients and include things like whole wheat, oats, and quinoa.
“Whole grains have more fiber, have a lower effect on blood sugar, are more nutrient-dense, and give longer appetite satisfaction and sustained fullness,” Dr. Snyder says.
Again, doctors stress the importance of continuing to exercise when you’re on a weight loss journey. “You still want to be active,” Dr. Ali says. “You want to at least maintain the activity that you’re already doing, and ideally increase it.”
Korin Miller is a freelance writer specializing in general wellness, sexual health and relationships, and lifestyle trends, with work appearing in Men’s Health, Women’s Health, Self, Glamour, and more. She has a master’s degree from American University, lives by the beach, and hopes to own a teacup pig and taco truck one day.
Fitness
Higher fitness levels linked to lower risk of depression, dementia – Harvard Health
People with high cardiorespiratory fitness were 36% less likely to experience depression and 39% less likely to develop dementia than those with low cardiorespiratory fitness. Even small improvements in fitness were linked to a lower risk. Experts believe that exercise’s ability to boost blood flow to the brain, reduce bodywide inflammation, and improve stress regulation may explain the connection.
Fitness
These 20-Minute Burpee Workouts Replaced His Entire Gym Routine – and Transformed His Physique
While many swear by them, most people see burpees as a form of punishment – usually dished out drill sergeant-style by overzealous bootcamp PTs. Often the final blow in an already brutal workout, burpees are designed to test cardiovascular fitness, muscular endurance and mental grit. Love them or loathe them, they deliver every time.
For Max Edwards – aka Busy Dad Training on YouTube – they became a simple but highly effective way to stay fit and lean during lockdown. Once a committed powerlifter, spending upwards of 80 minutes a day in the gym, he was forced to overhaul his approach due to fatherhood, lockdown and a schedule that no longer allowed for long, structured lifting sessions.
‘Even though I was putting in hours and hours into the gym and even though my physique was pretty good, I wasn’t becoming truly excellent at any physical discipline,’ he explained in a YouTube video.
‘I loved the intentionality of training,’ says Edwards. ‘The fact that every session has a point, every rep in every set is helping you get towards a training goal, and I loved that there was a clear way of gauging progression – feeling like I was developing competence and moving towards mastery.’
Why He Walked Away From Powerlifting
Despite that structure, Edwards began to question whether powerlifting was sustainable long-term.
‘My sessions were very taxing on my central nervous system. I was exhausted between sessions. It felt as if I needed at least nine hours of sleep each night just to function.’
He also noted that his appetite was consistently high.
But the biggest drawback was time.
‘I could not justify taking 80 minutes a day away from my family for what felt like a self-centred pursuit,’ he says.
A Simpler Approach That Stuck
‘Over the course of that year I fixed my relationship with alcohol and I developed, for the first time in my adult life, a relationship with physical training,’ says Edwards.
With limited time and no access to equipment, he turned to burpees. Just two variations, four times a week, with each session lasting 20 minutes.
‘My approach in each workout was very simple. On a six-count training day I would do as many six-counts as I possibly could within 20 minutes. On a Navy Seal training day I would do as many Navy Seal burpees as I could within 20 minutes – then in the next workout I would simply try to beat the number I had managed previously.’
This style of training is known as AMRAP – as many reps (or rounds) as possible.
The Results
Edwards initially saw the routine as nothing more than a six-month stopgap to stay in shape. But that quickly changed.
‘I remember catching sight of myself in the mirror one morning and I was utterly baffled by the man I saw looking back at me.’
He found himself in the best shape of his life. His energy levels improved, his resting heart rate dropped and his physique changed in ways that powerlifting hadn’t quite delivered.
‘It has been five years since I have set foot in a gym,’ he says. ‘That six-month training practice has become the defining training practice of my life – and for five years I have trained for no more than 80 minutes per week.’
The Burpee Workouts
1/ 6-Count Burpees
20-minute AMRAP, twice a week
How to do them:
- Start standing, feet shoulder-width apart
- Crouch down and place your hands on the floor (count 1)
- Jump your feet back into a high plank (count 2)
- Lower into the bottom of a push-up (count 3)
- Push back up to plank (count 4)
- Jump your feet forward to your hands (count 5)
- Stand up straight (count 6)
20-minute AMRAP, twice a week
How to do them:
- Start standing, feet shoulder-width apart
- Crouch down and place your hands on the floor
- Jump your feet back into a high plank
- Perform a push-up (chest to floor)
- At the top, bring your right knee to your right elbow, then return
- Perform another push-up
- Bring your left knee to your left elbow, then return
- Perform a third push-up
- Jump your feet forward
- Stand or jump to finish
Kate is a fitness writer for Men’s Health UK where she contributes regular workouts, training tips and nutrition guides. She has a post graduate diploma in Sports Performance Nutrition and before joining Men’s Health she was a nutritionist, fitness writer and personal trainer with over 5k hours coaching on the gym floor. Kate has a keen interest in volunteering for animal shelters and when she isn’t lifting weights in her garden, she can be found walking her rescue dog.
Fitness
Six ways your smartwatch is lying to you, according to science
You check your smartwatch after a run. Your fitness score has dropped. You’ve burnt hardly any calories. Your recovery score is really low. It’s telling you to take the next 72 hours off exercise.
The worst bit? The whole run felt amazing.
So why is your watch telling you the opposite?
Ultimately, it’s because smartwatches and other fitness trackers aren’t always accurate.
Smartwatches can shape how you exercise
Using wearable fitness technology, such as smartwatches, has been one of the top fitness trends for close to a decade. Millions of people around the world use them daily.
These devices shape how people think about health and exercise. For example, they provide data about how many calories you’ve burnt, how fit you are, how recovered you are after exercise, and whether you’re ready to exercise again.
But your smartwatch doesn’t measure most of these metrics directly. Instead, many common metrics are estimates. In other words, they’re not as accurate as you might think.
1. Calories burned
Calorie tracking is one of the most popular features on smartwatches. However, the accuracy leaves a lot to be desired.
Wearable devices can under- or overestimate energy expenditure (often expressed as calories burned) by more than 20 per cent. These errors also vary between activities. For example, strength training, cycling and high-intensity interval training can lead to even larger errors.
This matters because people often use these numbers to guide how much they eat.
For example, if your watch overestimates calories burned, you might think you need to eat more food than you really need, which could result in weight gain. Conversely, if your watch underestimates calories burned, it could lead you to under-eat, negatively impacting your exercise performance.
2. Step counts
Step counts are a great way to measure general physical activity, but wearables don’t capture them perfectly.
Smartwatches can under-count steps by about 10 per cent under normal exercise conditions. Activities such as pushing a pram, carrying weights, or walking with limited arm swing likely make step counts less accurate, as smartwatches rely on arm movement to register steps.
For most people, this isn’t a major problem, and step counts are still useful for tracking general activity levels. But view them as a guide, rather than a precise measure.
3. Heart rate
Smartwatches estimate your heart rate using sensors that measure changes in blood flow through the veins in your wrist.
This method is accurate at rest or low intensities, but gets less accurate as you increase exercise intensity.
Arm movement, sweat, skin tone and how tightly you wear the watch can also impact the heart rate measure it spits out. This means the accuracy can vary between people.
This can be problematic for people who use heart rate zones to guide their training, as small errors can lead to training at the wrong intensity.
4. Sleep tracking
Almost every smartwatch on the market gives you a “sleep score” and breaks your night into stages of light, deep and REM sleep.
The gold standard for measuring sleep is polysomnography. This is a lab-based test that records brain activity. But smartwatches estimate sleep using movement and heart rate.
This means they can detect when you’re asleep or awake reasonably well. But they are much less accurate at identifying sleep stages.
So even if your watch says you had “poor deep sleep”, this may not be the case.
5. Recovery scores
Most smartwatches track heart rate variability and use this, with your sleep score, to create a “readiness” or “recovery” score.
Heart rate variability reflects how your body responds to stress. In the lab it is measured using an electrocardiogram. But smartwatches estimate it using wrist-based sensors, which are much more prone to measurement errors.
This means most recovery metrics are based on two inaccurate measures (heart rate variability and sleep quality). This results in a metric that may not meaningfully reflect your recovery.
As a result, if your watch says you’re not recovered, you might skip training — even if you feel good (and are actually good to go).
6. VO₂max
Most devices estimate your VO₂max — which indicates your maximal fitness. It’s the maximum amount of oxygen your body can use during exercise.
The best way to measure VO₂max involves wearing a mask to analyse the amount of oxygen you breathe in and out, to determine how much oxygen you’re using to create energy.
But your watch cannot measure oxygen use. It estimates it based on your heart rate and movement.
But smartwatches tend to overestimate VO₂max in less active people and underestimate VO₂max in fitter ones.
This means the number on your watch may not reflect your true fitness.
What should you do?
While the data from your smartwatch is prone to errors, that doesn’t mean it is completely worthless.
These devices still offer a way to help you track general trends over time, but you should not pay attention to daily fluctuations or specific numbers.
It’s also important you pay attention to how you feel, how you perform and how you recover. This is likely to give you even more insight than what your smartwatch says.
Hunter Bennett is a lecturer in exercise science at Adelaide University. This piece first appeared on The Conversation.
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