For a midnight snack, choose a portion you intend to eat and compare its nutrition per bar as well as per 100g. A small oat flapjack, a protein bar and a fruit-filled cereal bar serve different preferences; check sugars, saturated fat and allergens on the exact pack rather than assuming that one type is suitable for everyone.
If you want a snack rather than a meal, check the weight of one bar and whether the nutrition panel describes that bar or a different serving. Oxford Health NHS Foundation Trust notes that a light snack can be useful when an empty stomach is distracting, while a heavy meal soon before bed can interrupt sleep.
If either nutrient matters to your choice, compare its amount per bar alongside energy, sugars and saturated fat. A protein label alone does not describe the whole snack.
Read the ingredients and precautionary allergen wording on the exact flavour and pack. A different bar from the same brand may have a different recipe or warning.
Start with the amount you would eat, then compare labels and ingredients across bars that meet your preferences.
| Priority | What to check | Your needs |
|---|---|---|
| Portion | Check the weight of each bar, how many pieces are in a wrapper and which quantity the serving figures describe. | I want to take one defined portion from a multipack, not mistake the whole wrapper for one serving. |
| Sugars and saturated fat | Compare both per-bar and per-100g figures. Where shown, UK traffic-light labels indicate whether sugars and saturated fat are high, medium or low. | A small bar appeals to me, but I still want to see what that portion contains rather than judge it by an oat or protein description. |
| Protein and fibre | Read the grams per bar and compare energy, sugars and saturated fat at the same time. | If protein or fibre is the reason I am choosing a particular bar, I want its actual per-bar amount, not just a claim on the front. |
| Ingredients and allergens | Check the exact pack for ingredients, highlighted allergens, precautionary statements and any dietary claim you require. | I need to know whether this flavour meets my dietary requirements; another product in the range is not enough to go by. |
Those descriptions do not replace the nutrition panel. In its 2025 review of 458 snack bars from 10 major UK retailers, Action on Salt and Sugar reported that 37% were high in sugars and 55% were high in saturated fat.
Compare sugars and saturated fat per 100g and per bar, alongside the portion you plan to eat.
Pack and serving formats differ. For example, the Graze Honey Oat Boost multipack contains four 30g boosts; a different wrapper may contain more than one piece.
Check the piece count and stated serving before using the nutrition figures to plan a single snack.
Ingredients and precautionary statements need to be checked for the particular bar. The cited Eat Natural peanut and dark-chocolate bar, for example, contains peanuts and soya.
If an allergen matters to you, read the current pack’s ingredient list and any ‘may contain’ statement rather than relying on another flavour’s label.
Its cereal-bar formats include crunchy, nut and protein varieties.
Oat Boost flapjacks offer a clearly specified multipack format. Tesco lists the Honey variety as four 30g boosts.
TREK offers plant-based protein-bar formats.
The range includes nut-led bars such as its peanut and dark-chocolate protein bar.
Its Rice Krispies Snack Bar is a cereal-and-milk format distinct from an oat flapjack or protein bar.
Older Alpen bar listings need checking before they inform a current cereal-bar purchase.
These multipacks cover oat, protein and fruit-filled cereal-bar choices for taking a portion as a midnight snack. Check the current pack for serving figures and allergens before deciding between them.
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A peanut-and-chocolate protein cereal-bar option if protein is your selection priority. The pack contains eight 40g bars; check the exact label for per-bar nutrition and allergens.
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An oat-flapjack option when you want to choose from four 30g portions. Check this flavour’s own nutrition panel and allergen statement rather than using figures for another Graze variety.
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Another four-pack of 30g Oat Boosts for a defined flapjack portion. Compare this flavour’s ingredients, allergens and per-bar figures with the Lemon Blueberry variety rather than assuming they match.
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A nut-flavoured protein-bar option in a pack of four 40g bars. Compare the portion’s full nutrition panel and allergen wording with other protein bars before choosing it for a late snack.
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A strawberry cereal-bar choice if you prefer a fruit-filled format to an oat flapjack or nut bar. The pack is labelled as six bars, 222g in total; check the current serving and sugars figures for the amount you would eat.
A small portion can be an option if you are hungry, but a cereal bar is not a sleep aid. Oxford Health NHS Foundation Trust says a light snack can be useful when an empty stomach is distracting and that a heavy meal soon before bed can interrupt sleep. Choose by portion, ingredients and the nutrition panel.
Use both: per-bar figures describe the portion you plan to eat, while per-100g figures let you compare bars of different sizes. Check how many pieces the stated serving covers.
No. Compare protein with the rest of the label and your intended portion. For example, Eat Natural lists 7.8g protein, 220 kcal and 10.0g sugars for its 40g peanut and dark-chocolate protein bar.
Read the exact current pack’s ingredients and any precautionary wording, even if you have bought another flavour from the brand. The Food Standards Agency explains that precautionary allergen labelling communicates possible unintentional allergen presence.
Do not assume an older listing describes a current product. Alpen’s UK manufacturer FAQ says several former bar lines are no longer made, including Alpen Light Bars, so check the exact product available when you buy.