Liquid Calories: The Coffees, Juices and Drinks That Add Up
Liquid calories are the energy you take in through drinks rather than food: milky coffees, juices, smoothies, soft drinks, sports drinks and alcohol. They matter for fat loss for one simple reason. Drinks rarely fill you up the way the same calories in food would, so you do not tend to eat less later to make up for them. A large milky coffee on the way in, a smoothie at lunch and two glasses of wine in the evening can add up to the size of a small meal without ever feeling like one. You do not need to give any of them up. You need to know which ones are doing the damage, and swap or shrink those first.
This is how I look at drinks with clients who are trying to lose fat while holding down demanding jobs.
Why drinks behave differently from food
Chewing, the time it takes to eat, and the bulk of food in the stomach all play a part in telling you that you have had enough. A drink skips most of that. You can finish a large flavoured latte in the time it takes to read your emails, and an hour later you are just as ready for lunch as you would have been without it.
That is the whole problem in a sentence. It is not that liquid calories are somehow worse calories. It is that they are easy to add and hard to notice, which makes them one of the most common reasons a sensible-looking diet does not produce the expected result. If you are trying to run a calorie deficit, drinks are often the gap between the deficit you think you are in and the one you are really in.
The usual suspects, ranked by how often they catch people out
Milky coffee
A small black coffee or an Americano with a splash of milk is close to nothing. The calories arrive with volume of milk, size of cup and anything added: syrups, whipped cream, sugar. A large latte with whole milk is a very different drink from a small flat white, and three a day is a very different week from one.
Large chains in England have had to show calories on menus since 2022, so the information is usually on the board or the app. Look once for your regular order. Most people are surprised by one drink, not by all of them.
Fruit juice and smoothies
These feel healthy, and they do contain vitamins. But blending or juicing fruit releases the sugars from the fruit’s structure, and a large bottle can contain the fruit of several pieces you would never eat in one sitting. The NHS counts fruit juice and smoothies as one of your 5 A Day at most, and suggests keeping them to a combined 150ml a day. Many shop-bought bottles are more than double that.
Soft drinks and energy drinks
Full-sugar fizzy drinks are the most obvious source, and most people already know. Energy drinks and some iced teas are less obvious. The NHS recommends adults have no more than 30g of free sugars a day, which includes sugars in juice and in sweetened drinks. A single can of a full-sugar soft drink can take you close to that.
Alcohol
Alcohol carries a lot of energy for its volume, and it tends to bring food with it: the bread basket, the late snack, the heavier breakfast the next day. The UK Chief Medical Officers advise not regularly drinking more than 14 units a week. A standard 175ml glass of 12% wine is about 2.1 units, and the NHS unit calculator will show you how quickly a normal week adds up. We cover this in more depth in alcohol and fat loss.
Sports and protein drinks
Sports drinks are designed for long, hard endurance efforts. For an hour of strength training they are usually unnecessary. Ready-to-drink protein shakes vary widely: some are lean and useful, others are closer to a milkshake. Read the label rather than the front of the bottle.
A one-week drinks audit
Before changing anything, find out what you actually drink. It takes very little effort and it is usually the most revealing week of a fat loss phase.
- For seven days, write down every drink that is not water, black tea or black coffee. Include size and milk.
- Do not change your habits during the week. The aim is an honest picture, not a good score.
- At the end, look up the calories for each regular drink once, using menu boards, apps or labels.
- Circle the two drinks that contribute the most across the week. Not per drink: per week.
- Change only those two, using the swaps below, and leave everything else alone for now.
That last step matters. Clients who try to clean up every drink at once tend to last a fortnight. Clients who change the two biggest ones usually keep the change, because it barely registers as a sacrifice.
Swaps that keep the habit and lose the bulk
| If you have | Try instead | Why it works |
|---|---|---|
| Large latte, whole milk | Regular flat white or a smaller size | Same ritual, less milk |
| Flavoured syrup coffee | One pump instead of two, or none on weekdays | Keeps it as a treat rather than a default |
| Large bottle of smoothie | Whole fruit with yoghurt | More filling, slower to eat |
| Juice with breakfast | A small glass, diluted with sparkling water | Taste stays, volume halves |
| Full-sugar soft drink | Sugar-free version or sparkling water with citrus | Removes the sugar, keeps the fizz |
| Large glasses of wine | Standard 125ml pours, with water alongside | Slower pace, fewer units |
Mistakes I see most often
Treating “healthy” drinks as free
Green juices, oat milk lattes, kombucha and coconut water all have reputations that run ahead of their labels. Some are low in calories. Some are not. The label decides, not the branding. Our guide to reading food labels covers what to look at first.
Cutting drinks and then eating the difference
If you drop a daily smoothie and replace it with a pastry because you are hungry at eleven, nothing changes. Replace a liquid snack with a solid one that has some protein in it, and the trade is usually in your favour.
Ignoring the weekend
Plenty of people drink very little from Monday to Thursday and then have a Friday and Saturday that undo the week. Look at the week as a whole. The audit above will show this quickly.
Under-drinking water
Thirst is sometimes mistaken for hunger, and people who drink little water often reach for something flavoured instead. Keeping a bottle of water on your desk is the least glamorous advice in this post and one of the most useful.
How this fits into training
When someone starts one-to-one training with me in Highgate, we look at food and drink together in the first weeks, because training alone rarely outruns a high intake. Drinks are often the easiest win, since nobody has to learn to cook anything new. On the InBody scanner in the studio we can then track whether the change is coming off fat rather than muscle, which is the point of the exercise.
Around sessions, water is enough for most people. A coffee beforehand is fine if it suits you. Our piece on coffee before a workout covers timing.
If you have diabetes, a heart condition, are pregnant, or take medication that affects fluid or blood sugar, check with your GP first before changing what you drink or starting a new training plan.
Questions we get asked
Do diet drinks count as liquid calories?
Sugar-free soft drinks contain very little energy, so they barely affect your calorie intake. Whether they suit you is a separate question, which we look at in our post on sweeteners and fat loss.
Is milk in tea worth worrying about?
A splash of milk in tea is small. It only becomes relevant if you drink a lot of large, milky cups a day. Check your audit before worrying.
Are protein shakes liquid calories?
Yes, but they can be useful ones when they help you reach your protein target. Count them as food, not as a drink you have on top.
Can I still have a glass of wine and lose fat?
Yes, if the total week fits your target. Most people do better with planned drinks than with an all-or-nothing rule. If you want help building that into a plan, the details and prices are on the personal training page.
Book with The Highgate House
Ready to start training properly? Email us at [email protected] with the service and the day that suits you, and we will come back to you with times.
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