I'm not a doctor, I found all the info online, so please DYOR before following any of the tips.
dm @v_1rtl if u have more good resources on those topics
This article will be continiously edited for more precise info and more health tips.
Prefer hot liquids over cold ones
Drinking hot water increases metabolism speed. I drink tea every morning and warm water throughout the day.
The hot drink provided immediate and sustained relief from symptoms of runny nose, cough, sneezing, sore throat, chilliness and tiredness, whereas the same drink at room temperature only provided relief from symptoms of runny nose, cough and sneezing. (source)
The decrease in body weight, body mass index and body composition scores of overweight subjects at the end of study period establishes the role of water induced thermogenesis in weight reduction of overweight subjects. (source)
Daily intake of warm water can help keep your body hydrated and your skin moisturized. Warm water helps to cleanse the body and repair the skin cells that are affected by the harmful free radicals. Drinking a glassful of warm water every morning on empty stomach can help decompose the food and improve the bowel movement. (source).
Don't drink coffee
Coffee temporarily but greatly increases blood pressure, which might be a problem for certain groups of people. It also disturbs your sleep if you drink it 6 hours prior going to bed. I very rarely drink coffee myself.
Caffeine may cause a short, but dramatic increase in your blood pressure, even if you don't have high blood pressure. (source)
The magnitude of reduction in total sleep time suggests that caffeine taken 6 hours before bedtime has important disruptive effects on sleep and provides empirical support for sleep hygiene recommendations to refrain from substantial caffeine use for a minimum of 6 hours prior to bedtime. (source)
Avoid alcohol
I drink alcohol pretty rarely (once to thrice in 3 months). Alcohol is very dangerous to health and is one of the most addictive substances, as being the fourth most dangerous substance after crack, meth and heroin.
(source) (same source data sheet)
"Moderate" alcohol consumption is a myth.