Elimination Diets (sometimes also referred to Exclusion Diets) was first proposed by Dr. Albert Rowe in 1926 and expounded upon in his book, Elimination Diets and the Patient’s Allergies, the first edition published in 1941.  Rosacea Trigger Avoidance is usually what is proposed by the NRS Factors That May Trigger Rosacea Flare-Ups which includes diet triggers, of which 18 are proposed:
Cheese (except cottage cheese)
Yeast extract (bread is ok)
Broad-leaf beans and pods, including lima, navy or pea
Citrus fruits, including tomatoes, bananas, red plums, raisins or figs
Spicy and thermally hot foods
Foods high in histamine
Alcohol, especially red wine, beer, bourbon, gin, vodka or champagne
Hot drinks, including hot cider, hot chocolate, coffee or tea
While probably most rosaceans after learning about the NRS Factors That May Trigger Rosacea Flare-Ups either from what others have told them or from their physician or on the internet may try to avoid items on this list in their diet; the results from avoiding these items in their diet may prove helpful to some but many report otherwise. This is because there has never been proven in any clinical study that a specific rosacea trigger will trigger a rosacea flare up in every case. Not one. The only exception is a study done by JK Wilkin that discovered that it was not the caffeine in coffee that produces flushing but instead the heat.  Liver, Yogurt, Sour Cream, Cheese, Eggplant, and Spinach are the subject of an article worth your time reading that will help you in your understanding how elimination diets may or may not help your rosacea, depending on what you think an elimination diet is.
Apparently some, according to this thread, feel that if a rosacean decides to try avoiding any of the rosacea diet triggers proposed by the NRS or some other source that this is an elimination diet. For example, a rosacean decides to avoid spicy and thermally hot foods that this one has engaged in an elimination diet. Dr. Michael agrees with me that this is not the case for he answers my question about this subject with the following statement:
“No, simply avoiding known or suspected triggers is not an elimination diet because this approach starts with the answer the elimination diet is designed to ask. Namely, what are my triggers or sensitivities?
A proper elimination diet involves two phases:
(1) an strict elimination phase whereby all potential offending foods and chemicals are avoided and
(2) a slow, systematic reintroduction of each potential offending food and chemical class in an attempt to identity your own individual sensitivities.” 
While an elimination diet may help you discover what is triggering your rosacea it is probably one of the more difficult diet approaches to take and certainly isn’t a popular one for there are few reports available that this has been successfully accomplished with rosacea. Simply avoiding certain food and drink which is what rosacea trigger avoidance is all about certainly isn’t an elimination diet. Click here for more information on GENERAL rosacea triggers and click here for rosacea diet triggers.
Why not volunteer and post your comment on elimination diets and what you think they are. Wouldn't it be amazing if rosaceans got together in a non profit organization like this one and actually do something together about rosacea? Do you see the reply button? If you look carefully you will see it and why not post your comment for other rosaceans to read? You may be surprised that your comment might be helpful to others.
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 Rowe, A., Elimination Diets and the Patient's Allergies. 2nd Edition. Lea & Febiger, Philadelphia, PA: 1944 [Second Edition Available]