Why eating less may be making thyroid weight gain worse
Many people with thyroid disorders believe eating less will help them lose weight faster. Experts say this approach can actually slow metabolism further and make weight gain harder to control.
Weight gain is often one of the first and most frustrating symptoms faced by people living with hypothyroidism. For many patients, the immediate reaction is to simply cut calories, skip meals, and eat less in the hope that the weighing scale will finally move down. But health experts warn that this common advice may actually worsen the problem instead of solving it.
According to doctors and nutrition experts, hypothyroidism already slows down the body’s metabolism. When people drastically reduce food intake, the body responds by conserving energy even more aggressively. This can lead to fatigue, hormonal imbalance, increased stress levels, and stubborn weight retention despite strict dieting.
On the occasion of World Thyroid Day, experts are urging people to shift the focus from “eating less” to “eating right.” They say thyroid-related weight gain is not simply a lifestyle issue or lack of discipline. Instead, it is often connected to bigger hormonal and metabolic changes that need proper diagnosis, nutrition, and medical support.
WHY EATING LESS CAN BACKFIRE
Celebrity dietitian and nutrition consultant Simrat Kathuria says one of the most harmful pieces of advice thyroid patients receive is to simply reduce their food intake.
“The body already experiences a slower metabolic rate in hypothyroidism. When calorie intake suddenly drops, the body interprets it as starvation and starts holding onto fat reserves more tightly,” she explains.
This survival response also increases cortisol, commonly known as the stress hormone. Higher cortisol levels may further contribute to weight gain, especially around the abdomen. As a result, many patients feel trapped in a cycle where they eat less but continue gaining weight.
Experts say this can also affect energy levels, mood, sleep quality, and muscle strength. Extreme dieting may leave patients feeling constantly tired, weak, and mentally exhausted.
NUTRITION MATTERS MORE THAN STARVATION
Rather than focusing only on restriction, experts recommend balanced and targeted nutrition for thyroid management.
Kathuria explains that adequate protein intake plays an important role in supporting metabolism and maintaining muscle mass. Nutrients like selenium and zinc are also essential because they help in thyroid hormone conversion within the body.
Foods such as Brazil nuts, pumpkin seeds, eggs, and other nutrient-rich options may support thyroid health when included as part of a balanced diet.
She also highlights the importance of maintaining regular meal timings. Consistent eating schedules can help stabilise cortisol and insulin levels, which may support better metabolic balance.
“This World Thyroid Day, the conversation should move from eating less to eating right,” she says. “For thyroid patients, proper nourishment is far more powerful than starvation.”
WHY MANY CASES GO UNDIAGNOSED
Public health analyst Dr. Sameer Bhati says many people continue struggling with unexplained weight gain without realising an underlying thyroid condition may be responsible.
“For millions with undiagnosed hypothyroidism, calorie restriction quietly makes things worse,” he says. “This is not a failure of willpower. It is biology.”
According to him, many patients spend months experimenting with diets and workout routines before thyroid testing is even considered.
He points out that relying only on TSH testing may not always provide the complete picture. In autoimmune thyroid conditions like Hashimoto's thyroiditis, antibody testing is often necessary for accurate diagnosis.
Women, in particular, may experience delays between early symptoms and final diagnosis. Symptoms such as fatigue, hair fall, dry skin, mood changes, irregular periods, and weight gain are sometimes dismissed as stress or lifestyle-related issues.
WHAT TESTS ARE IMPORTANT?
Experts say a detailed thyroid evaluation may include more than just a standard thyroid test.
According to Dr Bhati, a complete workup can include:
TSH
Free T3
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Free T4
Anti-TPO antibodies
Anti-TG antibodies
Fasting insulin
HOMA-IR
HbA1c
Lipid profile
Vitamin D
Vitamin B12
CBC
hsCRP in inflammation-related cases
Doctors may also recommend an ultrasound to examine the thyroid gland’s size, texture, or the presence of nodules. A heterogeneous echo texture may suggest Hashimoto’s thyroiditis.
FNAC, or fine needle aspiration cytology, is generally reserved for suspicious thyroid nodules and is not required in every patient.
WHO SHOULD GET SCREENED?
Health experts recommend immediate screening for people experiencing symptoms linked to thyroid dysfunction.
Dr Bhati advises women above the age of 30 to undergo thyroid screening every three years. Those with a family history of thyroid disease may need yearly screening.
Regular monitoring is also advised for:
Women after pregnancy
Patients with PCOS
People with diabetes
Individuals with persistent unexplained weight gain or fatigue
Experts stress that thyroid-related weight gain should not be viewed as laziness or poor self-control.
“Weight gain is often a signal from the body,” says Dr Bhati. “The right approach is to diagnose first and then treat through medication, nutrition, and regular monitoring. If the scale is not responding despite your efforts, it is important to get tested.”