The 9 Foods You Should Always Avoid on a Weight-Loss Diet

If you’ve decided it’s time to lose weight, get healthy or both, how you approach your diet can lead to success or frustration. "You control your own success," therapeutic dietitian Lena Beal, MS, RDN, LD, tells Piedmont Healthcare. "Adopting healthier behaviors today will help delay, deter, and reduce your risk of diseases like stroke, heart disease, and diabetes. It's never too late to make a difference." Here are seven things you should never do on a diet, according to experts.

Eating Too Little

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Not eating enough food can backfire and slow down your weight loss, experts warn. “Not eating enough can make it harder to lose weight,” Beal says. “If you’re not taking in enough to meet your daily requirements, your metabolism may slow down as your body goes into conservation mode.”

Being Too Restrictive

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Eliminating entire food groups may make it difficult, if not impossible, to sustain your diet over the long term. "Being restrictive is not sustainable. You have to think about looking at this for the long haul," registered dietitian Kathy McManus, director of the Department of Nutrition at Harvard-affiliated Brigham and Women's Hospital, tells Harvard Health. "Make it balanced so you don't feel deprived.”

Doing Too Much Too Fast

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Crash dieting is completely unsustainable and can harm your health. "If you're not going to [follow a diet] for the rest of your life, don't do it at all,” Beal says. "If you want to lose weight, focus on losing two pounds a week at most. Start by knowing what you are putting in your mouth and the effects it may have on your body."

RELATED: 10-Minute Workouts to Melt Abdominal Fat in 60 Days

Ignoring Calories

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It’s helpful to know exactly how much you eat and when you eat to make weight loss easier. "Research shows that people who track their food intake if they're trying to lose weight or monitor sodium in their diet, are more successful," McManus says. "It makes you aware on a regular basis of what you're putting in your mouth and how much you're eating… Maybe you'll see you're overeating at night because you're overly hungry.”

Drink Your Calories

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Eat your calories; don’t drink them. “One reason liquid calories sabotage weight loss is all in the name: calories,” primary care physician Susan Besser, MD, tells NBC News. “Persons who use liquids instead of food in a diet often think they are making healthy choices or lower calorie choices. But that isn’t necessarily so.”

Keep Unhealthy Foods Around

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Support your weight loss efforts by removing unhealthy foods from your home. “The best thing to do is surround yourself with healthy food," McManus says. "That's what you'll eat when you find yourself looking for a snack. But if you buy a half gallon of ice cream, eventually it will go into your stomach."

RELATED: 10 Foods to Avoid That Cause Inflammation

Be Sedentary

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Being active is important not just for weight loss but for overall health and happiness. “Physical activity is important if you are trying to lose weight or maintain a healthy weight,” says the CDC.

“More physical activity increases the number of calories your body uses for energy. Using calories through physical activity, combined with reducing the calories you eat, creates a calorie deficit that results in weight loss.” And if you enjoyed this article, take advantage of these 15 Quick Ways to Lose Body Fat Percentage in a Week.

Are you trying to lose weight but aren’t really getting anywhere? According to experts, you might be going about your weight loss journey the wrong way. In fact, even some of the top diet and fitness experts have made weight loss mistakes themselves. Body Network spoke to a few trainers and nutritionists and asked them about the biggest missteps they took on their fitness journeys.

1. Going Overboard with Calorie Counting

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While it is good to keep tabs on your food consumption, Risa Sheppard, Master Pilates trainer, creator of The Sheppard Method, advises not to go overboard. “Counting every calorie of every piece of food,” is one of the mistakes she made. “It became time consuming and frustrating.”

Related: I Lost Belly Fat & 17 Pounds With These 6 Simple Hacks

2. Starving Your Body of Carbs

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Mr. America Jason Kozma, a personal trainer in Los Angeles, reveals the biggest mistake he made while preparing for a bodybuilding competition. “I had gotten too heavy bulking up to add more muscle mass,” he explains. He spent four months dieting for a spring show “and still didn’t get in shape.” After a short break he reset his goal to a fall show and dove headlong into his diet. “I was using an extremely low carb approach as I felt I had too much fat yet to burn. What I actually did was I starved my muscles of carbohydrates for so long that at the end my body couldn’t assimilate carbohydrates and I couldn’t ‘pump u’ for the show,” he continues. “My body fat measured lower than ever for this show but I didn’t look as good as I had a year and a half prior at a higher body fat level. The net result was that I lost muscle using this approach: I was actually smaller and lighter than I was before the ‘bulk up.’” Note: He still won the show!

3. Doing Too Much Cardio

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Diet and fitness expert Adita Yrizarry-Lang, ISCA, NASM, ACE, AFAA, reveals that one of the biggest mistakes she made was doing too much cardio. “When I first started in fitness, this was the prescription…do a lot of cardio. The reality is that you burn more calories when you have muscle on your body, combining weights with cardio is the right way to do it,” she says.

4. Not Looking at Serving Size on Packages

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Yrizarry-Lang claims that another mistake is only looking at calories on a package, and not the serving size. “We were mesmerized by the lo-cal labeling on a package,” she says. “Unfortunately, we never looked at the serving size and then came to realize we were ingesting too many calories at a time.”

5. Falling Victim to Low Fat, Highly Processed Foods

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Just because something is low-fat doesn’t make it healthy. Yrizarry-Lang says that some people consume “too many processed carbs, because they are low fat.” While this might be okay for runners, going for 10 to 20 mile runs, “those carbs convert to fat,” for most of us.

Related: Alexia Clark Flaunts Chiseled Midsection and Reveals 3 Ab Mistakes You Are Making

6. Daily Weigh-Ins

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Weighing oneself every single day is another mistake, says Sheppard. “It can be discouraging,” she explains. “Try to weigh yourself less and pay more attention to how your clothes are fitting. Remember muscle weighs more fat so if you are on an intense exercise regime the muscle you gain will trim in less but may not show on the scale.”

7. Crash Diets

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If a diet seems too good to be true, it probably is. “The all-time worst” mistake people make is going on crash diets. Why? You might “lose weight at the moment” but you will “gain it back with a few extra pounds,” says Yrizarry-Lang. “This slows down the metabolism and makes it even harder to lose weight at a later date.”

8. Focusing on Exercise for Weight Loss

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One of the biggest mistakes people make is “thinking more exercise will cause them to lose weight,” says Sheppard. “80 percent is dieting and 20 percent is exercise,” she reminds.

9. Falling Victim to “Get Thin Fast” Scams

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Sheppard strongly advises against any products or diet that claim to help with rapid weight loss. “Do not succumb to quick weight loss scams or dangerous pills. Remember Rome wasn’t built in a day and neither is weight loss,” she says.

Related: 15 Foods That Fight Fat

10. Comparing Yourself to Others

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Remember that your fitness journey is your own and “comparing yourself to other people” will “only add to your stress and discouragement,” says Sheppard. “We are all built differently with different bone structure and hereditary genes. Love who you are inside and it will reflect on your outside.”

💪🔥Body Booster: Beware of low-fat, processed foods. Unless you run for 20 miles a day, you should probably pass on a highly processed energy bar – those carbs might convert to fat unless you are working them off.