Spinach - Spinach is great in the winter as it is said to increase metabolism and help raise body heat, not to mention the added dose of iron which can help keep you warm.
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Green tea - A steamy mug of green tea is already appealing in the winter, but the antioxidant flavonoids and caffeine are what gives it thermogenic properties.
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Oats - It's not hard to cozy up with a hot breakfast of oatmeal in the winter, but the fiber in the oats will keep you feeling warm, and full, until lunch.
Eggs - With a high amount of protein, calcium, and iron, eggs have a strong tendency to produce heat through our digestive system.
Cabbage and kale - Livestrong also notes that cabbage and kale are among the most effective heat-producing root vegetables.
Mangoes - This surprising fruit is usually associated with summer, but it's actually a "hot food," meaning it creates heat in the body, according to Ayurvedic studies.
Dates - Dates are high in minerals, fats, and fiber, and require more energy to digest, thereby producing more heat in your body.
Ginger - A 2012 study published in the journal Metabolism found that ginger, by way of its pungent compounds gingerol and shogaol, enhances thermogenesis.
Turnips - Turnip and its leaves reportedly help improve your overall cardiovascular health along with increasing your body temperature.
Hot peppers - Hot peppers not only add flavorful heat to dishes, but when consumed in moderation, certain peppers may help increase your internal body temperature.