What Happens If You Put Too Much Yeast In Bread?

If you’re in the process of making bread and realise you have weighed out the yeast incorrectly, you’ll want to know what happens if there is too much yeast in bread?

Is this you? If so, I’ll give you some quick answers to what happens and also some guidance so you know what to do if you add too much yeast to bread dough.

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What does yeast do to the bread?

Yeast is found in sourdough starters or in bakers yeast and has a few core roles to play in bread making. It reacts with the starches that are presented by the flour to create:

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  1. Carbon dioxide 
  2. Ethanol
  3. Lactic acid
  4. Organic acids

We most associate yeast with creating carbon dioxide gas. This is what gets locked in the breads crumb structure and makes the bread rise. The formation of ethanol, lactic acid and organic acids are just as vital to the process as they mature the dough.

How does dough maturation work?

The gluten strands formed from hydrated flour are not strong enough to retain gas on their own. To support the structure of the dough, the yeast converts some of the starch into natural dough conditioners. 

The development of ethanol, lactic acid, organic acid and natural enzymes supports the gluten to be able to transform flour, water, salt and yeast into bread. 

The conditioners support the doughs gas retaining properties, the elasticity and extensibility of the dough, as well as the keeping quality, aroma and the flavour of the bread.

A well-fermented dough that has been made over a long period of time will be matured so that it contains a high amount of natural dough conditioners

What happens if you use too much yeast?

When too much yeast is added to the dough, the activity of gas and ethanol increase rapidly to create a gassy dough that’s hard to work with! Due to the high gas activity, we are forced to reduce the mixing time and get the loaves baked quickly before they over-proof.

Dough which has a short fermentation period does not mature fully, leading to several quality issues once baked.

What happens to bread when too much yeast is added?

When proofing is rushed, the following faults can occur in the bread:

  • Irregular holes through the bread crumb
  • Ripped or ruptured crust
  • Pale coloured bread
  • Bread collapses when cutting or in the oven
  • Taste and smell of bread flavours will decrease
  • The bread smells and tastes of yeast
  • The bread smells and tastes of alcohol
  • Massive oven spring which results in the bread getting stuck in the oven
  • The dough gets overly gassy so kneading time is reduced which lowers the quality of the bread

How much yeast is too much?

Most standard bread recipes use 1.5-2% yeast in the recipe with the most common being 2% for everyday bread. The percentage used for the recipe is based on the bakers percentage for the bread made. This is where the percentage of each ingredient is derived from the total amount of flour used in the recipe.

If the percentage of yeast used is above 2.2% of the flour, the bread will start to taste and smell of yeast and is likely to suffer from the other common issues shown above.

Fresh, active dried and instant yeast conversion

The standard 2% yeast to flour ratio used in many bread recipes is based on using fresh yeast. If using instant yeast or active dried yeast we need to convert the recipe to determine how much to use. We can convert roughly by halving the fresh yeast to get the value for active dried yeast or dividing the fresh yeast value by 3 to get the measurement for instant yeast.

For accurate conversions, use these percentages to convert fresh yeast to active dried or instant yeast:

Where fresh yeast is 100%

Active dried yeast is 42%

Instant yeast is 33%

What to do if you add too much yeast to bread

The best thing to do if you have added too much yeast to the bread is to lower the temperature of the dough for the bulk fermentation. Cool temperatures slow down the production of gas whilst still allowing the dough to continure to mature. If this can’t be done, there are a few other tips for working with over-yeasted dough:

  • Midway through mixing, place the dough in the fridge to cool for ten minutes before mixing again
  • Prepare for a big oven spring by under proofing the bread slightly
  • Increase the salt to 2.2% of the flour used in the recipe. Salt helps to control the yeast.
  • Trade white flour for whole-grain flour if possible, it will slow down the rate that the starch breaks down into sugars
  • Don’t cut the bread before baking if it has had a quick rise
  • Place in the fridge and use as a pâte fermentée in the following day’s dough

The breads smell & taste change when too much yeast is added

If we make changes to control the yeast, such as cooling the dough down, there is one issue that cannot be reversed. If the yeast is added at levels higher than 2.5% the bread will smell and taste less like bread, and more like yeast. There is no way to reverse this.

Ending thoughts on using too much yeast

It’s a pain when you realise you have added too much yeast. The best thing we can do is to cool it down as soon as possible.

I have found that I have to calculate and write down the recipe before I start baking, otherwise accidents happen regularly! Check out the how to improve bread homepage for other related articles.

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  2. I have been having a problem with a bread recipe I am using, and it always overproofs. I was wondering today as we have really lowered our proof time and it still collapsed when we opened the oven door. I began to wonder if it is too much yeast. Your article was perfect and will provide the math I need to make this work.

    Thank you so much.

  3. can I use it as a preferment for future breads?
    Can I freeze it for later uses ?

    thnak you

  4. Preferment, yes you could if you were to put it in the fridge early enough. You probably could freeze it, not sure why you would want to?

  5. I have a gluten free recipe that uses flax and chia seeds in place of xanthan gum. The seed mixture doesnt agree withme so i substituted the seeds for 1 table spoon of xanthan gum and increased the water by a half a cup. When using the seed mix the bread rises to a perfect smooth top and without the seeds then using xanthan gum once baked the top of the loaf looks like an exploded popcorn kernal. I sliced the loaf down the middle and it just exploded more once done. Any isea how i can turn this into a perfecr unexploding loaf of bread?

  6. I would think that the seeds will be slowing down the rise, mainly due to their weight. This means there is likely to be extra yeast added to compensate. When you’ve removed the seeds, the weight of the dough is reduced so the yeast is making your dough rocket. I’d reduce the yeast in your recipe and see if that improves things.

  7. Seems I make a loaf once every week and a half, so I will get back to you then. Thanks so much!

  8. I kneaded the dough for croissaint
    But I feel the yeast is a little more than it needs
    I put it in the freezer now
    What should I do while working?

  9. Thanks for sharing, this is a fantastic post. Really looking forward to read more. Want more.

  10. I have attempted several times to make a sour dough starter. I have followed instructions to the tee. I have tried no less than four recipies. I have even tried a few ideas of my own. As q rule day two is text book perfect. Day 3 thru 5 plus never performs. I have used different flours, different water, different temperature, sealed containers & loose covered containers. I use a wood spoon, I use scales all to no avail.

  11. Hey Jerry!

    How long have you fed them for? Have you been feeding daily? How warm have you been keeping it?

    Here’s a bit of info that might go some way to reassure you, if you were not aware:

    “Starters tend to be bubbly in the first couple of days, but between day 2 and around 7 they will dip in activity. This is because wild yeasts are creating gas at first, but as it becomes more acidic, wild yeasts are hindered. This process continues as the starter becomes more acidic and alcoholic, forcing the strains of yeast and bacteria change. After a few days, even weeks, the starter will culture wild yeasts and bacteria that can operate in these conditions. The best thing you can do is keep the conditions the same until it establishes (as you mentioned) such as flour, temperature, cleanliness etc.”

    A starter won’t die (unless it gets mouldy) so keep feeding the same one until it starts to rise. Flour and water are all that is required. Using 20% rye flour to 80% bread flour is probably the best combination scientifically. Leave the jar lid loosely covered as it needs a bit of oxygen in the early stages, but not so loose that it dries out on the surface.

  12. Thank you for writing this. I doubled a focaccia recipe today and doubled the yeast. Wish I had read this earlier. I’ll try and cool it down and won’t do it again.

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