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This article contains summarized information. I encourage you to google studies and other articles about it, so you can further educate yourself and understand better.

Refined sugar is processed sugar added to most of the manufactured products we often consume. Its effects on our body and health are scientifically proved to be non-beneficial. These are a few:

1. Could contribute to ACNE.

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Several studies have demonstrated that acne is related to our diets, and a high intake of refined sugar could definitely lead to develop acne. This is because sugary foods spike blood sugar and insulin levels very quickly, causing oil production, inflammation, and increased androgen secretion.
Some of these studies:
https://www.pubmed.ncbi.nlm.nih.gov/22070422/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4884775/

2. DEPRESSION.

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Often consuming products that are high in refined sugar has been associated with a higher risk of developing depression. This does not mean that eating sugar causes depression, but it certainly increases the odds, as shown in the following study: https://pubmed.ncbi.nlm.nih.gov/26109579/

3. Accelerates SKIN AGING process.

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We spend so much on skincare products, and truth is, we could be doing so much more for our skin by simply eating better.

When sugar and proteins mix in your body, it forms compounds named AGEs (advanced glycation end products). AGEs damage collagen and elastin, causing the skin to lose its firmness and begin to sag over time. A study made in the UK showed that women who consumed more products with added sugar had a more wrinkled appearance:
https://pubmed.ncbi.nlm.nih.gov/17921406/
Consumption of refined sugar has also been linked to increasing cellular aging (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4326908/).

4. Makes you TIRED.

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As mentioned before, the consumption of refined sugar spikes blood sugar and insulin levels. This leads to a brief energy boost, but it's shortly followed by a drastic drop in blood sugar. So if you are feeling tired during the day, if you experience a lack of energy, it might be because you are often consuming products high in added sugar.
https://regeneratemedicalconcierge.com/tired-after-eating-sugar-during-the-holidays/

5. Affects your MEMORY and ATTENTION.

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Some researches suggest high sugar consumption causes inflammation in the brain, resulting in slowed cognitive function and deficits in memory and attention.

6. Makes you CRAVE MORE sugar.

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The more you eat, the more you crave.

Because of the brief energy boost previously mentioned, overeating refined sugar might alter our brain's reward system. This means that (apart from the fact that it tastes good), our brains will relate the consumption of sugary foods or refined carbs to a boost in our mood and energy, making us crave more and more sugar.
https://academic.oup.com/nutritionreviews/article/73/5/296/1862679

Other negative effects:

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High consumption of refined sugar could in long term increase the risk of getting various diseases such as cancer, cardiovascular diseases, gout, dementia, cavities… etc.

You could literally google “Negative effects of refined sugar on the body” and get hundreds of articles and studies that talk about all of the above mentioned, and more.
Now, this does not mean you should go crazy and paranoid, and avoid everything and anything that contains added sugar. Most of these effects are associated with excess of consumption. So, as long as your daily diet is based on healthy, non-processed foods...

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You can do your cheat meal once or twice a week and include those refined carbs and sugar.

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Dielo Articles.

Also available in Tumblr (https://itsdielo.tumblr.com/post/623834094132969472/effects-of-refined-sugar-on-our-bodies).