Because a new survey has shown many coffee bars' specialist chilled coffees are 'toxic sugar bombs' – with the worst offenders containing up to 20 teaspoons of sugar- the equivalent of a whole pack of cookies.
The investigation by UK newspaper the Sunday Mirror, which focused especially on Starbucks and Costa Coffee, claimed the highest sugar content was found in a Costa Toffee Creamy Cooler. Even the 'medium' version of this drink contains a shocking 81.6 grams of sugar - the same content as in 31 digestive biscuits.
Even more distressing for the hard-working female bodybuilder or fitness athlete the drink also contains the recommended daily amount of saturated fat for a woman in just a few sips.
Starbucks also serves up sugar-laden diet-busters which would wreck weeks of hard work in the gym.
Avoid the Strawberries and Cream Frappuccino, which contains a staggering 76.2 grams of sugar – that's more than 18 teaspoons' worth per large cup – and a massive 459 calories because of its cream and full-fat milk content. Almost as many calories as a McDonald's Big Mac.
The Starbucks peppermint mocha frappuccino in venti with whole milk and whipped cream is 540 calories.
A spokesman for Starbucks said: 'We promote choice at Starbucks and were one of the first high street food and drink retailers to display calorie content on our menu boards, as part of our commitment to the Department of Health’s Responsibility Deal.
'All product nutritional information is also easily available on our website to help inform customers’ choices.
'The Strawberries and Cream Frappuccino is one of a range of summer drinks we offer at Starbucks, from indulgent treats like a Frappuccino to a Refresha.
For example, a grande (medium) Cool Lime Refresha contains 17g of sugar and less than 100 calories. Customers can also customise their drinks to reduce calorie and sugar content - we have a Strawberries and Cream Frappuccino Light, which reduces calories by approximately a third.
Customers can also choose to have a smaller size, skimmed milk, sugar free syrups, and forgo whipped cream.'
Costa's strawberry cooler is an even worse offender - a large size with cream and full fat milk is 653 calories - that's the same as having a McDonald's burger and fries.
Meanwhile, Caffe Nero's whole milk caramel frappe latte is 455 calories, the equivalent to two large glasses of white wine and some pretzels.