Why Is It So Hard to Lose Weight With Insulin Resistance or Diabetes? 7 Possible Reasons

Overview

• Insulin resistance does not make weight loss impossible. Blood sugar, thyroid, or other tests should be selected according to symptoms and risk, not ordered blindly.

• A stable scale does not always mean body fat is unchanged. Water, digestion, menstrual cycles, and new exercise can temporarily hide progress.

• Small additions such as cooking oil, sweetened chai, snacks, restaurant meals and weekend portions may close an intended calorie gap.

• Exercise is valuable for health, but it may not cause much weight loss unless eating patterns and daily movement support it.

• Poor sleep, stress, metabolic adaptation, medicines, and certain health conditions can make weight management harder.

Quick Answer: Can Insulin Resistance Make Weight Loss Harder?

Yes. Insulin resistance, prediabetes, or diabetes can make weight loss more challenging, but they do not mean weight loss is impossible. Weight loss still depends on using more energy than you consume over time, while hunger, sleep, stress, medicines, hormones, age, food access, and the body’s response to weight loss can affect that balance.

The World Health Organization (WHO) describes obesity as a chronic disease influenced by biological, environmental, social, and psychological factors, not simply willpower.

7 Reasons Weight Loss May Become Harder

1. The scale may not show the full picture

Your body weight includes fat, muscle, water, stored carbohydrate, food, and stool. It can change from day to day even when your body fat has not changed.

A salty meal, constipation, menstrual-cycle changes, travel, or a new workout can temporarily increase water weight. This can hide fat loss on the scale for several days or even a few weeks.

Strength training may also help you maintain or build muscle while losing body fat. A 2025 systematic review found that adding resistance exercise to a weight-loss diet helped protect fat-free mass and increased fat loss. However, it did not cause much more total scale-weight loss than diet alone.

What you can do

Compare your average weight over several weeks instead of focusing on a single reading. Weigh yourself under similar conditions each time.

You can also measure your waist about once a month using the same method. Waist size is mainly a measure of health risk, but changes may also help you track progress.

If weighing or measuring yourself causes anxiety, obsessive behaviour, or disordered eating, use measures recommended by a qualified healthcare professional instead.

2. Small additions can close the intended calorie gap

Nutritious food still contains energy. Small amounts of oil or ghee used during cooking, nuts, sweetened tea or coffee, juice, lassi, alcohol, biscuits, namkeen, restaurant gravies, and unplanned bites can add up.

Larger weekend, festival, or restaurant meals may also balance out the lower intake maintained during the rest of the week.

Food type can affect how much a person eats. In a closely controlled trial involving 20 adults, participants ate about 500 more calories per day and gained weight when they were offered an ultra-processed diet rather than a minimally processed diet.

The study was small, and each diet was followed for only two weeks. It does not predict how every person will respond, but it shows that the type and form of food can affect appetite and energy intake.

What you can do

Track what you normally eat and drink for one week, including:

• Meals and snacks
• Drinks
• Cooking oils and ghee
• Restaurant or takeaway food
• Weekend meals

Use this short review to understand your usual eating pattern and identify areas that may be easy to adjust. You do not need to track your food permanently. Avoid food tracking if it increases anxiety around food, obsessive behaviour, or symptoms of an eating disorder.

3. Exercise may improve your health before it changes your weight

If you are exercising but not losing much weight, your workout is not necessarily failing.

Exercise can improve:

• Fitness
• Muscle Strength
• Insulin Sensitivity
• Blood Sugar Management
• Heart Health
• Mental Health
• Long-Term Weight Maintenance

These benefits can happen even when the change on the scale is small. However, exercise can increase hunger in some people. Some people may also move less during the rest of the day after a difficult workout.

Smartwatches, fitness trackers, and gym machines only estimate how many calories you use. These estimates can be inaccurate and should not automatically be treated as extra calories that need to be eaten back.

The CDC notes that most weight loss usually comes from reducing energy intake. Combining food changes with physical activity creates a more reliable energy gap.

For general health, adults should work towards 150–300 minutes of moderate aerobic activity each week. They should also include muscle-strengthening activity on at least two days per week, as their health and ability allow.

What you can do

Combine planned exercise with more everyday movement, such as walking, standing, taking the stairs, doing household work, and breaking up long periods of sitting.

Choose an eating and activity plan that you can continue rather than one that feels extreme or exhausting.

4. Poor sleep and stress can affect your routine

Short or disturbed sleep may increase hunger, cravings, and tiredness. It can also make cooking, exercising, and choosing suitable portions more difficult.

Most adults should aim for at least seven hours of sleep each night, although individual needs can vary.

Stress does not automatically “block fat burning,” and feeling stressed does not prove that your cortisol level is abnormally high. However, stress may lead to comfort eating, disturbed sleep, less activity, or irregular meals.

Shift work, long commutes, travel, and frequently changing meal times can create similar difficulties.

Loud snoring, pauses in breathing, gasping during sleep, morning headaches, or strong daytime sleepiness should be assessed for possible sleep apnoea.

5. Your body adapts after weight loss

After you lose weight, your smaller body generally needs less energy than it did before. Hunger may also increase, while resting energy use and unplanned daily movement may decrease. This can make the energy gap that originally caused weight loss much smaller.

This response is sometimes called metabolic adaptation. A systematic review found evidence of adaptive thermogenesis in many studies, although the size of the effect varied. It was smaller or not significant in some better-designed studies.

Metabolic adaptation does not mean that your metabolism is permanently “broken.”

The National Institute of Diabetes and Digestive and Kidney Diseases also reports that increased appetite after weight loss may be a stronger reason for a weight-loss plateau than reduced calorie burning.

What you can do

Review your current portions, hunger, activity, sleep, and daily routine. Make one small and sustainable adjustment instead of beginning a crash diet.

6. Certain health conditions may affect weight management

Several medical conditions can affect appetite, energy, sleep, movement, or body weight.

Polycystic ovary syndrome

Polycystic ovary syndrome, or PCOS, may involve:

• irregular or absent periods;
• acne;
• increased facial or body hair;
• fertility concerns; and
• increased metabolic risk.

International PCOS guidance states that structured lifestyle support can be effective. It also says that routinely available insulin tests have limited clinical value and are not recommended as part of routine PCOS care.

Hypothyroidism

An underactive thyroid may cause tiredness, cold intolerance, constipation, dry skin, and some weight gain.

However, hypothyroidism usually causes relatively modest weight gain. It rarely explains marked obesity by itself, and some of the additional weight may be caused by salt and water retention rather than body fat.

Age and menopause

Muscle mass and energy needs may change with age. During and after menopause, body fat may also shift towards the abdomen.

These changes can make an old weight-management strategy less effective, but they do not make weight loss impossible.

Other relevant conditions

Depression, binge-eating disorder, sleep apnoea, chronic pain, and other conditions may affect appetite, sleep, movement, or the ability to follow a plan consistently.

7. Some medicines can influence weight

The effect of a medicine differs from person to person. Medicines that may promote appetite or weight gain include:

• glucocorticoids;
• certain antipsychotics;
• some antidepressants;
• some anti-seizure medicines;
• injectable progestins;
• certain beta-blockers; and
• some
•  sedating antihistamines.

Among diabetes treatments, insulin, sulfonylureas, meglitinides, and thiazolidinediones can promote weight gain. Other diabetes medicines may be weight-neutral or may support weight loss.

Do not stop insulin, steroids, psychiatric medicines, or any prescription treatment on your own. Ask the prescriber to review the medicine, dose, and possible alternatives. Treating the original medical condition safely remains the priority.

A Practical Plan For The Next Few Weeks

1. Measure the trend

Use consistent weigh-ins, waist measurements, or clothing fit. Focus on changes over several weeks rather than day-to-day movement on the scale.

2. Review one normal week

Include drinks, cooking fats, snacks, restaurant food, and weekend meals. Do not record only your “best” days.

3. Make meals more filling

Include vegetables, pulses or beans, and a suitable source of protein such as dal, curd, paneer, tofu, eggs, fish, or chicken. Adjust portions of rice, roti, or other grains when needed instead of automatically removing entire food groups.

4. Combine aerobic and strength activity

Include activities that improve your breathing and heart rate, along with exercises that strengthen your muscles. Also increase everyday movement and break up long periods of sitting.

5. Protect your sleep and plan for triggers

Prepare for shift work, travel, family events, restaurant meals, and emotional eating. Planning ahead is often more effective than relying on willpower at the last moment.

Change one or two things at a time, then assess the trend over several weeks. People taking insulin or medicines that can cause low blood sugar should discuss major diet or exercise changes with their healthcare professional.

Which Tests May Help

There is no universal “weight-loss resistance panel.” Testing should be based on age, symptoms, medical history, and risk factors. ICMR guidance recommends diabetes screening for Indian adults over 30 and earlier when risk factors such as family history, abdominal weight gain, high blood pressure, previous gestational diabetes, or PMOS/PCOS are present.

The 2026 ADA Standards of Care advise confirming an abnormal diabetes result in an asymptomatic person. HbA1c is not a direct test for insulin resistance. Fasting insulin and HOMA-IR may be useful in selected specialist settings, but there is no universal HOMA-IR cutoff that applies to every population and laboratory.

When To See A Doctor

Arrange a medical checkup if your weight remains unchanged despite a consistent plan, especially if you also have:

• Excessive thirst, frequent urination, blurred vision or recurrent infections

• Irregular or absent periods, increased facial hair, acne or fertility concerns

• Persistent fatigue with cold intolerance, constipation or dry skin

• Loud snoring, gasping during sleep or significant daytime sleepiness

• Binge eating, purging, severe restriction or intense distress about weight

• Unexpected rapid weight gain, swelling or breathlessness

Chest pain or severe breathlessness requires urgent medical care.

The Bottom Line

The answer to ‘Why can’t I lose weight with insulin resistance or diabetes?’ is usually a combination of measurement, appetite, routine, sleep, adaptation, medicines and health, not one ‘bad’ food or hormone. Start by checking the multi-week trend and making sustainable changes. If symptoms or metabolic risks are present, use targeted testing rather than guesswork.

Take the Next Step: Check Your Blood Sugar

If you have symptoms or risk factors for diabetes, don’t rely on guesswork. Speak with a qualified healthcare professional about whether blood sugar testing is right for you. If testing is recommended, you can book an HbA1c Test, Weight Management Screening, or Diabetic Care Package with Redcliffe Labs.

Ready to take the next step? Explore your testing options and check availability for home sample collection in your area to book your slot.

Frequently Asked Questions

Does insulin resistance make weight loss impossible?

No. Insulin resistance does not create a permanent ‘fat-loss lock,’ and a stalled scale cannot diagnose it. Sustainable food and activity changes, together with appropriate medical care, can still support weight and metabolic health.

Which test confirms insulin resistance?

There is no single standardized routine blood test that confirms insulin resistance for everyone. Clinicians usually assess fasting glucose, HbA1c or an oral glucose tolerance test alongside waist size, blood pressure, lipids, symptoms and medical history.

Can diabetes medicines affect weight loss?

Yes. Insulin, sulfonylureas and some other diabetes treatments may influence weight. Do not change or stop a prescription on your own; ask the prescriber to review the medicine, dose and possible alternatives.

Can eating too little stop weight loss?

Severe restriction can lower energy expenditure, reduce everyday movement, increase hunger and cause muscle or nutrient loss. It does not make the body create fat without available energy, but it can make a plan unsafe and difficult to sustain. Very-low-calorie diets require medical supervision.

Is a low carbohydrate diet better for weight loss?

No. Different balanced eating patterns can support weight and blood sugar management. A 12-month randomized trial found no significant weight-loss advantage for a healthy low-carbohydrate diet over a healthy low-fat diet. Food quality, portions, and long-term adherence matter most.

Does menopause make weight loss impossible

No. Menopause may change fat distribution, sleep, and body composition, while age-related muscle loss can reduce energy needs. An individualized eating plan, resistance training, regular movement, and adequate sleep can still improve weight and metabolic health.