Yes, you can use too much sugar for fermentation, as excessive amounts can overwhelm and dehydrate yeast, causing a stuck fermentation (where yeast stops working) or a final product that's too sweet, because the yeast can't convert all the sugar into alcohol, often hitting its tolerance limit (around 13-14% ABV) before finishing, leaving residual sugar. High sugar acts as a preservative, and adding it in stages, using a hydrometer, and ensuring proper temperature helps manage this.
Too much sugar could stress the yeast and stall or slow fermentation. You may also end up with way too sweet of a product if your yeast hits it's ABV limit before all the sugar is ``consumed''.
A little sugar, up to three percent, speeds up fermentation. The yeast processes the added sugar first, saving the time it would take to break down starch into sugar. With over three percent sugar, however, the fermentation rate no longer increases. [1] Above six percent, sugar actually decreases the rate.
Too much sugar can stress yeast (making for more hashness) out and impede (slow or stop) it. The most common outcome is a really sweet brew that takes a long time to finish, but if you go really overboard the yeast can stall or fail.
Finally, the amount of sugar absolutely affects yeast fermentation. Essentially, the more sugar you have, the more alcohol you will produce.
Some styles favor sugar additions (many Belgian styles and double IPAs), but there are recipes that give guidance on amounts. A single pound is often used in 5 gallons but some use more. I would not advise adding sugar unless you are OK with the resulting impacting of higher ABV with a thinner, dry-tasting result.
The answer is that you can always safely reduce the amount of sugar in a recipe, because sugar doesn't make things safe. The only thing that makes a jam, jelly or other sweet preserve safe for canning in a boiling water bath canner is the acid content, because that's what prevents any potential botulism growth.
Glucose, also known as dextrose, is a simple sugar that is highly fermentable. It's often used in brewing because it ferments cleanly and doesn't contribute much flavour to the final product. It's readily available at brewing supply stores.
Too much sugar
If your recipe has more than 10% sugar to the flour weight (e.g. more than 10g of sugar for every 100g of flour) then you will need to add a little more yeast to compensate or be prepared to wait longer for the dough to rise.
We tested our hypothesis and the results showed that the 4% concentration of sucrose was the most effective concentration to produce the greatest production of yeast. Therefore, 4% of sucrose concentration would be the best concentration to use for the most effective fermentation of alcohol and baking.
How to Proof or Test Yeast Activity
A pinch of sugar will make yeast bubble up, thus proving that the yeast is still active and hasn't expired. However, it doesn't actually help (or hinder) the rising of the bread.
Sugar is optional; a little bit makes yeast happy, but too much—generally, more than 1/4 cup per 3 cups of flour—slows yeast down.
The 20-minute wine rule is a simple guideline to bring wines to their optimal serving temperature: put red wines in the fridge for about 20 minutes to cool slightly (as room temp is too warm), and take white wines out of the fridge for about 20 minutes to let them warm up a bit (as too cold masks flavors). This helps unlock the full aromas and flavors, as serving wines too hot or too cold mutes their complexity.
If you over-ferment the dough you run the risk of the gluten structure degrading and the loaf turning into a puddle of goo before your eyes, never to be retrieved and destined for the bin.
Conclusion: Adding a pinch of sugar to proofing yeast isn't a deal-breaker in breadmaking, but it doesn't hurt. If anything, it helps a little.
A dough that has a high percentage of sugar (10% or more) will need more yeast than a bread made without sugar and will take a longer time to rise. A dough with more than 5% sugar (to flour weight) will brown on the surface earlier in the baking time than a dough with no added sugar or with less than 5%.
While some remedy this problem with the addition of simple sugars, adding too much can have the opposite effect by hindering fermentation of maltose as well as stress the yeast to the point undesirable characteristics are produced, which is why some brewers stagger their sugar additions over time during fermentation.
Yeast feeds on sugar so by adding a tablespoon or two provides yeast a readily available food. This increases yeast's activity and speeds up fermentation as well. However, adding a large amount of sugar to your dough will affect yeast's metabolism. Sugar is hygroscopic which means it absorbs moisture from the dough.
The question we often get asked is can I save money by just using normal, regular caster sugar instead of brewing sugar (Dextrose)? Well yes, you can, but you should definitely read this article to know the issues with this approach.
Eating too much sugar can contribute to people having too many calories, which can lead to weight gain. Being overweight increases your risk of health problems such as heart disease, some cancers and type 2 diabetes.
If you can't find preserving sugar then just use regular granulated sugar and skim any white froth off the surface of the marmalade once it has boiled and reached setting point and has been taken off the heat.
If your dish is a little too sweet, try rounding out the sweetness by adding flavors or ingredients that are sour, bitter, or spicy. It may be obvious not to add more sweet ingredients, but you should also stay away from salty ones since they actually bring out the sweetness in food.