No matter what’s happening in the news, it seems a new diet is always trending or a celebrity is hawking another miracle diet. We asked Jennifer Cholewka, RD, a dietitian and Advanced Clinical Nutrition Coordinator with the Mount Sinai Health System, about the pros and cons of some of the hot new diets.

Why is there so much hype surrounding diets? Why are they such a hot trend?

Diets are always going to be a hot topic. People are always looking for ways to lose weight as fast as they can and keep it off. But there’s never going to be a quick fix.

Keto is really trending these days.

I’m not a big fan of the keto diet. Yes, you can eat a lot of vegetables. But I don’t see how a diet that encourages eating lots of butter, mayonnaise, bacon, and cheese can be healthy over the long term. Everyone I know who has tried the keto diet loses weight. But it’s not possible to keep it up very long. Ketosis is a metabolic process in which the body, when it runs out of glucose, burns stored fats and then ketone bodies, the substances your body produces while you are following these dietary restrictions.  Our bodies prefer to use carbohydrates, such as starches and sugars like glucose, as the primary substrate for energy, for brain function, and organ function. If you’re putting your body into ketosis, your body isn’t meant to live in that state over the long term. It’s not sustainable.

Ketosis helped our ancestors survive starvation mode eons ago. They couldn’t count on regular meals. People only went into ketosis when they were starving and in dire straits. And in forcing your body to shift its preferred metabolic pathway, I see nothing but trouble over the long term.

Sometimes people rely on folk wisdom with diets like the Keto and Paleo diets. They say that our bodies have not evolved along with society, and these diets are more natural since they reflect the way we were 50,000 years ago.

Yes, people often latch onto that. Paleo is a very restrictive diet. It is technically a healthy diet. It can also be high in fat, especially saturated fat. If you have cardiovascular disease, that would be an issue. That’s why it’s important to talk to a physician if you’re overweight and trying one of these diets. You might lose weight, but in eating things like nuts that are higher in saturated fats your risks might outweigh the benefits.

Why are these fad diets so popular?

People crave rules. They want restrictions. They want to be told what to eat—and what not to eat. Dieting can be overwhelming. They don’t want to have more choices. And I think that’s why some of these diets like keto and paleo are trending. It’s simple. They’re given a list of what they can have and what they can’t have. They can eat the same thing every day if they want. All that matters is that you follow the formula, whether it’s the keto formula or the paleo formula. But you can’t keep it up over time. And that’s why people yo-yo with their weight. They may lose weight, but they gain it back rather quickly, unfortunately.

People often latch onto celebrities and their diets. For instance, Kim Kardashian lost 70 pounds on the Atkins diet, along with weight training. So they say, it worked for her, I’ll do that.

People will always pay attention to celebrities and their lifestyles. They see Kim Kardashian is following some diet that’s trending. Sure, she looks great. But she also has a personal trainer that she works with six days a week. She’s also on a very restrictive diet. I’m sure she has a nutritionist or a wellness coach that’s overseeing this whole plan. And she probably has someone preparing her meals. This isn’t a lifestyle most people can follow. Because if you’re fully going to adopt the Kim Kardashian weight loss approach, it means taking on the whole package. Celebrities are always going to have more resources, guidance, and control over their lifestyle. After all, their looks are part of their career and their income. We don’t have that luxury, unfortunately.

If you don’t understand everything that you’re going to have to do—and if you have no support, no guidance, no clinical advice—it’s very unlikely that you’re going to follow that diet for very long. Also, Kim Kardashian is quite young. We don’t know what the long-term effects of restricting carbohydrates like that are for someone that young.

What about seeing a dietitian? Is that something people should do?

I think it’s always great to touch base with a dietitian—specifically a dietitian—if you’re looking to make any sustainable changes to your diet. There are many ways to connect with dietitians that don’t necessarily involve expensive private counseling fees, or even face-to-face counseling. A lot of dietitians work through online platforms like Rise, Noom, or My Fitness Pal. I encourage people to do some research. See what is easiest for you to get started and get some support through your weight loss journey or health journey.

What is the difference between a dietitian and a nutritionist?

A registered dietitian is a person who has gone through undergraduate training, an accredited internship, passed the registered dietitians exam, and met all the credentialing requirements. After their name you would see “RD.” There are no credentialing or educational requirements for nutritionists. That being said, nutritionists can certainly offer some insight or be supportive through a diet or lifestyle change. Again, I encourage people to do their research, make sure the person is qualified, and decide whether their services are a match for your goals.

The popularity of oat milk has exploded in the last few years. From Starbucks adding an oat milk beverage to its menu to Chobani launching a line of oat yogurts, it’s clear that oat milk is more than a fad.

However, is oat milk the best milk for you?

We spoke with Carrie Morowitz, RDN, a senior clinical dietitian at Mount Sinai Health System, about the recent popularity of oat milk and whether you should consider adding it to your diet.

The popularity of oat milk has grown exponentially. What do you think sparked this?

Oat milk has been around for a while, but in the past two years it has become much more popular. I believe that stems from a move to more plant-based products. Now companies are making oat milk-based yogurts, and oat milk is widely available in restaurants and cafes, something we never used to see.

A debate is raging: oat milk vs. almond milk vs. cow’s milk. Is oat milk a healthier option?
In certain ways, oat milk is healthier than other milk options. But in some other ways, it’s lacking. For example, oat milk has more fiber than cow’s milk or nut-based milk. An average cup of oat milk has about two grams of fiber. However, oat milk has more carbohydrates. That’s especially important if you’re trying to monitor your carb intake, or if you have diabetes. A glass of oat milk has about 15-20 grams of carbs, whereas a glass of regular cow’s milk has only about 8 grams. Oat milk is also vegan and contains no soy or nuts. So for people with common allergies or lactose intolerance, it’s a safer option.

Is oat milk gluten free?

Usually, oat milk is considered gluten free. But you need to check for the additives. If it is made with certified gluten-free oats, it’s a good gluten-free option.

Can oat milk replace cow’s milk in a traditional diet?

It depends on the individual. If you have diabetes, oat milk may not be the best option since it’s the highest carbohydrate-containing milk of those other options. If you’re a diabetic who already uses almond milk, I don’t think switching from almond milk to oat milk would be very beneficial. If you are looking to move towards a more plant-based diet, oat milk may be a good option for you. However, make sure to check the label and ensure that there are no added sugars, as a product simply being plant-based can trick you into thinking it’s the healthiest option.

Carrie Morowitz, RDN, is a senior clinical dietitian at Mount Sinai Health System.

New Yorkers are born tough, but not Stone-age tough. Our ancestors were hunter-gatherers who often went periods of time without food while foraging. Humans had adapted to the unpredictability of getting their next meal.

But now we have “evolved” to expect three square meals a day, not to mention snacks.

“Weight loss has become a cultural obsession,” says Jennifer Cholewka, RD, CNSC, CDN, Clinical Nutrition Coordinator at The Mount Sinai Hospital. “And intermittent fasting is a trending topic. But it has roots in how we have evolved as human beings.”

Scientists are discovering that our bodies adapt to intermittent fasting in ways that our ancestors did. And according to a recent article in The New England Journal of Medicine, fasting has health benefits that extend far beyond weight loss. It seems that “when” we eat can be just as important as “what” we eat.

What is intermittent fasting?

With intermittent fasting, there are scheduled times when you eat and times when you don’t. Medical researchers have studied three approaches and shown them to be effective.

Daily time-restricted feeding means narrowing the time you eat to a shorter period of time during the day, usually eight hours. The time that you’re fasting is 16 hours each day. So you might stop eating at 8 at night, and not eat again until noon the next day. After 10-12 hours, your body throws a “metabolic switch” and you start burning through the glucose stored in your body. Your liver stores about 700 calories of glucose, and once gone, your body starts burning away that hard-to-get-rid-of belly fat.

5:2 intermittent fasting means that you eat as you normally do, five days a week. On the other two days, you only eat one moderately-sized meal. The two days that you’re fasting should not be consecutive. And your goal should be one 500-calorie meal on those days. You could work up to this gradually, by starting with one day a week. Your meal on that day could be 1,000 calories. Try that for a month, and then extend it during the second month to two days a week. The next month, reduce your meals to 750 calories. And then the next month, shoot for 500 calories.

Alternate day fasting is the most extreme version. On the days that you eat, keep it to a 12-hour window. Then you will fast that night and not eat anything the next day. It’s important to note that you can drink as much water as you want, and also tea and coffee if you don’t add any calories like milk, half-and-half, or sugar. You can also take vitamins, supplements, and of course, your normal meds. Talk to your doctor though, because certain meds and supplements need to be taken with food. So your plan might be to eat Sunday, Tuesday, Thursday, and Saturday. And then the next week, it would be Monday, Wednesday, and Friday.

What’s the payoff?

As if being svelte wasn’t enough, the benefits of intermittent fasting cited in The New England Journal of Medicine include:
• Cancer prevention
• Cellular and DNA repair
• Diabetes prevention and improvement
• Prevention of heart disease and stroke
• Greater mental acuity and brain health
• Greater muscle endurance

Some of these benefits are related to weight loss. Intermittent fasting increases your metabolism so you burn more calories, and it tends to target fat around the central organs. Belly fat is worse for the heart and causes inflammation. And less cholesterol means less heart disease and risk of stroke.

But once your “metabolic switch” kicks in, there are a host of other benefits. Once your body runs out of glucose, it starts converting ketone bodies from the liver for fuel. And this causes a wave of other changes throughout the body, because ketone bodies aren’t just fuel, they give orders to a variety of other cells and molecules that can affect health.

Scientists have been looking at the relationship between intermittent fasting and cancer in animals for quite a while. Calorie restriction or alternate day fasting has been shown to slow the growth of many tumors and increase their response to chemotherapy and radiation. Studies on humans are promising, but care must be taken to avoid malnutrition. Consultation with your doctor is key.

Another process triggered by the ketone bodies is called autophagy, which repairs the normal cells in the body. It’s like cellular house-cleaning, where the cells get rid of old proteins. Studies on both humans and animals demonstrate physical benefits. In one study, young men who fasted for 16 hours lost fat while maintaining muscle mass over a period of two months of resistance training. Balance, coordination, and endurance all improved in animals during fasting studies.

Brain power gets a boost, too. Verbal memory, spatial cognition, short-term and associative memory are all improved with humans in fasting studies. This is powerful news for the prevention of Alzheimer’s and Parkinson’s diseases. Neurological benefits have also been documented for multiple sclerosis and rheumatoid arthritis.

What’s the downside?

To gain the benefits, intermittent fasting isn’t a quick fix; it’s a lifestyle. Maintaining periods of not eating can be hard to stick to. But starting with a gradual program and working up to longer periods of fasting can help. In the beginning, you can expect to feel hungry, but science tells us that this is as much psychological as physiological. Drinking water when you feel hunger pangs can trick your body into feeling full. You might feel a bit foggy—but good news, black coffee and tea are your friend. And of course, if you’re under any type of medical treatment such as chemotherapy, consult your doctor first.

Throughout history, spiritual literature is full of examples of people who fasted for purification. On the basis of the latest research, it seems that the glow of health is here for modern-day fasters.

Rebecca Guterman, MS, RD, CDN, is the Senior Dietitian at Mount Sinai’s Derald H. Ruttenberg Treatment Center which offers a wide range of outpatient services for all cancer diagnoses, with the exception of breast cancer.

What Does Protein Do?

Protein plays a role in many body functions. It helps cells communicate within our body, moves compounds through the blood, plays a role in energy metabolism, and helps with muscle contractions and building. Proteins such as collagen, elastin, and keratin are found in the bones, teeth, skin, tendons, cartilage, hair, and nails. Other proteins provide the body with protection against bacteria or viruses. Minerals such as copper, iron, and zinc are stored in body tissues bound to proteins.

Kelly Hogan, MS, RD, CDN, is a registered dietitian who focuses on breast cancer nutrition for the Dubin Breast Center of The Tisch Cancer Institute. Ms. Hogan creates patient education and wellness programs and provides individual counseling in the areas of wellness, weight management, and symptom/side effect management.

While diets do not promote prolonged weight loss, they often lead to the following:

Increased cravings

Restricting certain foods and food groups often makes us want them more than ever.

Higher risk of bingeing

The restrictive nature of diets can also cause an increase in bingeing, the body’s physiological response to energy deficiency and starvation.

Nutrient deficiencies

Over long periods of time, eliminating certain foods or food groups can lead to deficiencies in fiber, calcium, and other vitamins and minerals.

A negative relationship with food

In some cases, the hyper-focus on food can lead to disordered eating, which profoundly impacts quality of life.