Drink choices are among the most overlooked determinants of dietary quality — the calories, sugars, and additives in beverages often receive less attention than those in food, yet UK adults obtain a significant proportion of their total daily calories and added sugar from drinks. Understanding which drinks support health, which are nutritionally neutral, and which meaningfully impair it provides a practical framework for one of the most impactful dietary choices available.
Water: The Optimal Default
Water is the optimal primary hydration source for adults — zero calories, no additives, universally available, and completely effective at meeting the body's hydration requirements. The NHS recommends 6–8 glasses (approximately 1.5–2 litres) of fluid daily, with water as the primary recommendation. Tap water in the UK is safe and high-quality — there is no nutritional justification for bottled water over tap water for most UK consumers. Adding fruit slices, cucumber, or fresh mint makes plain water more appealing without adding calories. Sparkling water is equally hydrating and for those who miss fizzy drinks, provides the carbonation sensation without sugar or sweeteners.
Tea and Coffee: More Beneficial Than You Might Think
Plain tea and coffee are among the most health-positive beverages available — they count toward fluid intake (the diuretic effect of caffeine is too small to meaningfully reduce net hydration at moderate intakes), and both are rich in polyphenols with evidence for cardiovascular, metabolic, and cognitive protection. The UK's tea-drinking culture is nutritionally beneficial when tea is drunk without sugar and with only moderate milk additions. Black coffee and green tea provide the most polyphenols with the fewest added calories. The problems begin with additions: two teaspoons of sugar in every cup adds 40g of free sugar daily for a five-cup-a-day drinker — the entire recommended daily limit. The British Nutrition Foundation tea and coffee guidance documents the health evidence.
Milk and Dairy Drinks
Plain whole or semi-skimmed milk is an excellent beverage — protein, calcium, vitamin B12, and iodine in a single glass. Fortified plant milks (soya, oat, almond, pea protein) provide comparable calcium when fortified and are appropriate alternatives for those avoiding dairy. Flavoured milks and milkshakes add significant free sugar and should be treated as occasional treats rather than daily beverages.
Fruit Juice and Smoothies
A 150ml glass of unsweetened fruit juice provides vitamin C and counts as one of your 5 A Day — but its sugar content without fibre produces a blood glucose response comparable to a sugary drink. The NHS 5 A Day guidance recommends maximum one glass of juice daily and counts it as only one portion regardless of quantity consumed, specifically because juicing removes the fibre that makes whole fruit a superior choice. A home-made smoothie with whole blended fruit retains the fibre and is nutritionally superior to juice.
Drinks to Limit
Sugar-sweetened soft drinks: A single can provides 35g of sugar — more than the daily recommended limit. The UK's Soft Drinks Industry Levy (the "sugar tax") has reduced sugar content across many brands, but regular consumption of full-sugar soft drinks remains one of the most impactful dietary patterns to address. Energy drinks: High in caffeine (often 150–200mg per can), large quantities of added sugar, and various stimulant compounds. Not appropriate for children or adolescents and should be moderated by adults. Alcohol: Empty calories, sleep-disrupting, and associated with increased risk of multiple cancers and other conditions. UK Chief Medical Officers recommend no more than 14 units weekly with regular alcohol-free days — the NHS alcohol guidance provides the full recommendation.
Fresh Healthy Food Delivered to Your London Office
Making consistently healthy food choices is much easier when quality food is delivered directly to you. Vanda's Kitchen near St Paul's EC4 brings certified halal, 100% nut-free, freshly prepared lunches to City of London offices — built around exactly the healthy food choice principles covered in this article. View our team lunch options or WhatsApp us about delivery to your office.
For more on hydration, see our dehydration and fatigue guide and our optimal hydration guide.
Fresh Healthy Food for London Offices
Vanda's Kitchen near St Paul's EC4 delivers certified halal, 100% nut-free, freshly prepared lunches to City offices — built around the whole food, balanced nutrition principles covered here. Full allergen labelling, Selfridges Food Hall quality. View our team lunch options or WhatsApp us.
Frequently asked questions
Does coffee actually count toward your daily fluid intake?
Yes. The diuretic effect of caffeine at moderate intakes is too small to meaningfully offset the fluid contributed by the drink. Plain tea and coffee both count toward the NHS recommended 6 to 8 glasses of fluid daily. The British Nutrition Foundation and NHS Eat Well guidance both confirm this.
Is sparkling water as hydrating as still water?
Sparkling water is equally hydrating to still water. The carbonation does not reduce absorption or hydration effectiveness. For people who find plain still water unappealing, sparkling water provides the fizzy sensation of soft drinks without any sugar, sweeteners, or additives.
How much sugar is actually in a typical can of fizzy drink?
A standard 330ml can of regular cola or similar fizzy drink typically contains around 35g of sugar, which exceeds the total recommended daily limit for free sugars for UK adults. The UK Soft Drinks Industry Levy has reduced sugar in many reformulated products, but full-sugar versions remain well above this threshold.
Are plant milks nutritionally equivalent to cow's milk for hydration?
Fortified plant milks — particularly soya, oat, and pea protein varieties — provide comparable calcium and often similar energy content to semi-skimmed cow's milk. However, the protein content varies significantly. Soya milk is closest to dairy in protein; almond milk is considerably lower. Check the label for fortification and protein levels.
What is the evidence on alcohol and hydration?
Alcohol is a diuretic and does impair hydration at higher intakes. UK Chief Medical Officers recommend no more than 14 units weekly with regular alcohol-free days. Beyond hydration, alcohol is associated with disrupted sleep architecture and increased risk of multiple health conditions, making it worth moderating independently of its hydration effects.