7 Best Foods to Eat in Winter to Keep Your Body Warm and Healthy

Does a bowl of chili actually raise your body temperature, or does it just make your mouth think it did? That question matters more than it sounds, because the answer changes what “warming food” should mean to a diabetic, a thyroid patient, or someone with IBS who’s been told to eat ginger, jaggery, and millet all winter without being told why — or whether it’s safe for them.

There are really three separate things happening when a food “warms” you, and almost no list of winter foods separates them: diet-induced thermogenesis (your body burning calories to digest and metabolize food, generating real heat), chemesthetic warmth (spice compounds triggering nerve receptors that feel hot but don’t raise core temperature), and slow digestion (dense, fibrous foods that sit in the gut and produce a lingering, non-thermal sense of fullness people mistake for warmth). Here’s what the actual physiology says about each, and who should stay away.

Myth: Chili, Ginger, and Pepper Raise Your Body Temperature

Capsaicin, the compound in chili peppers, activates a receptor called TRPV1 — the same receptor family that responds to actual cold exposure and triggers the body’s sympathetic nervous system. A review of brown adipose tissue and thermogenic food ingredients explains that capsaicin and related compounds can mimic cold exposure closely enough to activate and even recruit more brown fat over time, through what researchers call the TRP–sympathetic nervous system–brown fat axis. That’s a genuine metabolic pathway, not just a sensation.

But “activates the same pathway as cold” is not the same as “produces a comparable amount of heat.” The review describes this as a contributor to fat metabolism and energy expenditure over time, not a mechanism that noticeably shifts your core temperature after one spicy meal. What you feel within minutes of eating chili — flushing, sweating, a hot face — is local vasodilation and nerve signaling, not your internal thermostat moving. Ginger works on a milder version of the same chemesthetic pathway.

Who should avoid it: people with hyperthyroidism already have an elevated resting metabolic rate and an overactive sympathetic nervous system; stacking stimulant-like TRP agonists on top of that can worsen palpitations and heat intolerance. People with IBS or acid reflux often find capsaicin triggers cramping or burning long before any metabolic benefit would appear.

Myth: Humans Don’t Really Have “Fat-Burning” Brown Fat, So None of This Matters

For decades, brown adipose tissue (BAT) was considered a newborn-only tissue that disappeared in adults. That changed when PET scans originally done to track tumors revealed consistent, symmetrical areas of active BAT in adult humans — mainly around the neck and collarbone, with smaller deposits near the spine, chest, and kidneys. So yes, adults do retain functioning brown fat.

What’s less publicized is how slow and small its response is to diet rather than cold. A temperature-acclimation study of five healthy men had them sleep in rooms set to 24°C, then 19°C, then back to 24°C, then 27°C, one month at each temperature. Mild cold (19°C) measurably boosted BAT activity and improved insulin sensitivity after meals; warm conditions suppressed it. Diet-induced thermogenesis increased only after a month of cold acclimation — it didn’t change the body’s baseline, cold-induced thermogenesis itself. This was a small study, five men, over four months, and it says more about sleeping in a cooler room than about any single food.

The warmth you feel from spicy or hot food is almost always a nervous-system sensation, not a measurable rise in body heat — real diet-induced thermogenesis exists, but it unfolds over weeks of consistent exposure, not a single bowl of soup.

Myth: Jaggery and Millets Generate Enough “Heat” to Matter Metabolically

Jaggery’s reputation as a warming food and millets’ reputation as a fibre-rich wheat substitute are both reasonable on nutrition grounds, but neither has anything to do with measurable thermogenesis. Digesting any food costs energy — this is the real, universal version of diet-induced thermogenesis — but the heat it produces is a side effect of normal metabolism, not something that scales up because a food is “traditionally warming.” Jaggery is still concentrated sugar; eating more of it to chase a warming effect only adds glucose load, not meaningful heat.

The body’s actual largest engine for non-shivering heat production isn’t digestion at all — it’s skeletal muscle. A review of skeletal muscle thermogenesis describes a protein called sarcolipin that lets muscle cells generate heat by making calcium pumping intentionally inefficient, independent of shivering. This pathway, triggered by cold and activity rather than any single food, is proposed as a far more substantial contributor to whole-body energy expenditure than anything achievable by eating ginger or jaggery in food-sized amounts.

Who should be cautious: diabetics should treat jaggery as sugar with extra steps, not a metabolic exception. People with chronic kidney disease need to watch portion sizes of dense winter staples like root vegetables and millets, since both can be relatively high in potassium and phosphorus, nutrients damaged kidneys struggle to clear.

Myth: A Hot Drink Is a Hot Drink — Herbal Tea and Coffee Warm You the Same Way

This is one of the least examined claims in winter food advice. Herbal tea warms you two ways: the liquid itself is hot, and some herbal compounds may mildly engage the same chemesthetic receptors as spices. Coffee and caffeinated tea add a third mechanism — caffeine stimulates the sympathetic nervous system, the same signaling pathway described as driving brown fat activity in the TRP-SNS-BAT axis research. That means caffeinated drinks have a plausible, if modest, direct metabolic stimulation component that herbal tea doesn’t.

The trade-off is vasodilation and heart rate. Caffeine’s stimulation can also raise heart rate and blood pressure temporarily, which is why it’s not a universal “drink more for warmth” recommendation — people with anxiety, arrhythmia, or uncontrolled hypertension often do better with warm, non-caffeinated fluids even if the thermogenic effect is smaller.

Myth: “Warming” Foods Are Safe for Everyone to Load Up On in Winter

The biggest gap in most winter food advice is treating “warming” as a universal green light. It isn’t. Fat tissue itself behaves like an endocrine organ, releasing signaling molecules called adipokines that influence inflammation and insulin resistance, as described in a review of adipokines and metabolic disease. That’s a relevant reminder for diabetics specifically: the metabolic risk from sugar-heavy “warming” foods like jaggery comes from this inflammation and insulin pathway, not from the cold itself.

• Diabetics: limit jaggery and sweetened millet preparations; favor fiber and protein-paired portions over “warming” sugar.
• Hyperthyroid patients: go easy on chili, black pepper, and large amounts of ginger, which can compound an already elevated metabolic and nervous-system state.
• IBS patients: capsaicin and very high-fiber millets can both aggravate cramping and bloating; introduce slowly.
• Kidney patients: moderate potassium-dense root vegetables and millets rather than treating them as unlimited winter staples.

None of this means these foods are bad — it means “warming” should be read as a flavor and tradition category, not a dosage-free metabolic prescription.

Sources

• Brown Adipose Tissue, Diet-Induced Thermogenesis, and Thermogenic Food Ingredients (2020)
• Skeletal Muscle Thermogenesis and Its Role in Whole Body Energy Metabolism (2017)
• Unexpected evidence for active brown adipose tissue in adult humans (2007)
• Temperature-acclimated brown adipose tissue modulates insulin sensitivity in humans (2014)
• Adipokines mediate inflammation and insulin resistance (2013)