Trying To Lose Weight? Avoid Making These 14 Mistakes That Can Harm Your Progress

Lauren Kirkbride | March 17, 2025 10:00 pm

Losing weight is strenuous in itself. But when you're working to shed pounds and still seeing no results, that can become frustrating enough to quit. Your diet could stumble on some common mistakes that can be easily fixed. Eating a little more protein can make your diet feel a lot better, as can the right kind of exercises that scientists have determined as best for reducing fat.

Learn some of the most common weight loss techniques and the science behind them. Keep reading and take these tips to help make your weight loss journey a success.

Don't Always Trust The Scale

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Our weight fluctuates throughout the day, even increasing or decreasing by five pounds depending on when you use the scale. "If you notice a dramatic increase on the scale, chances are it's due to water," says Dr. Anita Petruzzelli, M.D. of BodyLogicMD. Weight loss takes time, and stepping on the scale at the wrong time of day can give you a false impression of where you're at.

Body weight naturally increases due to constipation, food intake, water, weather, hormone changes, and amount of salt you eat. One researcher explains that body weight especially increases in summer due to a hormone that conserves water.

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Are You Eating More Calories Than You Thought?

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To lose weight, we need to burn more calories than we're consuming. But a study in 1992 and later in 2013 determined that most people underestimate the number of calories they eat per day. The New England Journal of Medicine outlined that ten people claimed not to lose weight while eating 1,200 calories a day when, in fact, they were eating closer to 2,000.

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Double-check your portion sizes, as this is where most people mistake their calorie intake. High-calorie foods such as nuts and cheese require smaller servings.

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Don't Eat Too Few Calories

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The amount of calories required to lose weight varies for every person, according to research published in the International Journal of Obesity. However, eating too few calories leads to muscle loss and slower metabolism, prompting the body to cling to fat resources. In short, low-calorie diets are counterproductive.

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A 2006 study published in the Environmental Health and Preventive Medicine magazine compared the results of a 1,462 calorie diet to a 1,114 calorie diet and found that the latter resulted in a slower metabolism. Doctors advise people to never eat fewer than 1,000 calories a day, though some can eat under 1,200.

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Be Careful Not To Over-Exercise

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Exercising retains muscle, speeds up fat loss and quickens your metabolism. But studies demonstrate that working out too much will damage the weight loss journey. Two studies from 2013 to 2016 confirm that over-training increases your stress, and depletes adrenal hormones that regulate negative emotions.

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"Overtraining can be a part of healthy training, if only done for a short period of time," researchers clarify in the Journal of Novel Physiotherapies. "Chronic overtraining is what leads to serious health problems, including adrenal insufficiency." Working out too often or too vigorously leads to long-term health problems and is not sustainable.

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Lifting Weights Improves Weight Loss

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At least four studies have illustrated that resistance training, which includes squatting and weight lifting, significantly affect weight loss. Researchers for the International Journal of Cardiology support that weight training leads to increased metabolism, lower belly fat, and strengthened muscle mass.

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Besides weight lifting, you can fulfill resistance training through planking, squats, wall sits, and arm raises.

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Hit The Treadmill To Lose Belly Fat

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Aerobic exercises, such as running and walking, reduce belly fat. A study published in Obesity Review found that aerobic exercise is "central" for reducing visceral adipose tissue (VAT), which is fat tissue located deep in the abdomen around internal organs.

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Spot exercises (losing fat in one spot specifically) have no scientific backing, but aerobic exercises have displayed fat reduction in waistline and belly through multiple studies. These workouts include jumping rope, lunges, stationary bike, swimming, kickboxing, and elliptical.

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Are You Overestimating How Many Calories You Burn?

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Most people believe that they're shedding more calories during a workout than they actually are. In one study, sixteen men and women burned 200-300 cal during exercise sessions, but most believed they had burned over 800 cal.

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If you mistake the number of calories you burn after a session, you may eat more later. According to Harvard Health Publishing, the number of calories burned over 30 minutes average as follows: running 270-350 cal; yoga 120-180 cal; weight lifting 90-133 cal; and bicycling 210-311 cal. All listed calories come from moderate intensity workouts.

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Eat Enough Protein

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Eating enough protein supports weight loss in several different ways. A study reports that increasing dietary protein from 15% to 30% left participants feeling fuller for longer, making them eat 575 fewer calories per day. Researchers who published their findings in the American Journal of Clinical Nutrition suggest that high-protein diets improve body weight management and heart health.

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A 2013 research report in the European Journal of Nutrition recommends eating more protein for breakfast to reduce calorie intake throughout the day. High-protein foods include eggs, oats, meat, nuts, cheese, yogurt, whey protein supplements, beans, seeds, and fish.

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And Eat Enough (Viscous) Fiber

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Fibers are carbohydrates that cannot be digested by the body. A 1997 study in The Journal of Nutrition from Oxford recommends doubling your daily fiber intake to lower your daily calories up to 130 fewer per day. This mainly pertains to viscous fiber, a soluble fiber that passes through most of your gut unchanged until it finally dissolves into usable energy.

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Because these fibers digest slowly, they lower sugar levels, increase metabolism, and keep us fuller for longer, according to several studies. You can consume viscous fiber through beans, flax seeds, brussels sprouts, asparagus, and oats.

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Accurately Measure Serving Sizes

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Portion size is the number of a single food added to the meal. Many confuse this term with serving size, which is the amount of foods measured for dietary guidance, such as by the Dietary Guidelines for Americans. Most people overestimate what an accurate serving size contains. For instance, one study reports that most people could not tell the difference between dishes with varying portion sizes.

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Serving sizes are measured by cup and ounce, so it's best to use measuring cups to determine the proper serving size. You can find recommended serving sizes on the product's nutrition label.

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Don't Eat Breakfast If You're Not Hungry

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Breakfast can be an essential daily meal if you're hungry for it. The recommendation to eat breakfast if you're not hungry may be misguided, according to a 2013 study in physiology and a 2014 study in The American Journal of Clinical Nutrition. Changing one's breakfast habits made little to no difference in participants' dietary health, both studies state.

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The 2014 research recorded that those who skipped breakfast ate more for lunch, but consumed 408 cal less in the day overall. On the flip-side, letting yourself grow too hungry can cause poor food decisions, so it's best to eat only when hungry.

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Are Your Expectations Realistic?

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Scientists for Obesity Research examined 3,000 people aiming for weight loss over 12 months. By the end of the trial, 51% of people dropped out because they did not attain what they expected to achieve. "Unrealistic weight goals should be tackled at the very beginning of treatment," the report claims.

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The Centers for Disease Control and Prevention (CDC) approximate that healthy weight loss averages around 1-2 pounds per week, but even this may rely on vigorous exercise for some people. The CDC also asserts that losing 5-10% of body weight can improve your health dramatically.

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Avoid Highly Processed Foods

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In 2013, researchers examined the foods available within almost 56,000 Brazilian households and compared it to weight. They concluded that "Greater household availability of ultra-processed food products in Brazil is positively and independently associated with a higher prevalence of excess weight and obesity." But this isn't specific to Brazil; families everywhere gain more weight from highly processed foods.

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A couple of researchers have suggested that processed foods cause inflammation in our gut that leads to weight gain. To lose weight, revert to whole, single-ingredient food options as much as possible.

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Sleep Well, Or Your Weight Suffers

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In 2008, scientists reviewed 696 studies and over 634,000 participants (both children and adults) to settle whether better sleep affects body weight. They recount that adults with poor sleep had a 55% greater chance of becoming obese. Children face even worse odds, with an 89% greater risk.

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One study recorded in the Annals of Internal Medicine found that dieters who have less sleep maintain more weight and feel hungrier during the day. Make sure you're getting enough sleep through your dieting process to prevent this from happening.