EPISODE · Jun 22, 2026 · 29 MIN
Why Your “Food Sensitivities” Might Actually Be Undereating
from Dear Runner Bod, · host Serena Marie RD
If you’ve ever thought, “my gut just can’t handle foods like it used to,” this episode is going to challenge that narrative ….in the best way. Because while it’s easy to blame gluten, dairy, or sugar… the real issue I see over and over again in runners (and active women) is chronic underfueling. In this episode, I break down: How undereating impacts your gut lining and digestion Why low energy availability can lead to increased food sensitivities The connection between gut symptoms and RED-S (Relative Energy Deficiency in Sport) What’s actually happening physiologically (think: slowed motility, reduced enzyme production, and impaired intestinal integrity) Why eliminating more foods might be making things worse…not better If your list of “trigger foods” keeps growing, it might not be your gut failing you… it might be your body asking for more support. This episode will help you start listening differently. Jacked Granny Protein Bars have around 16 grams of protein, the perfect post-run snack or mid-afternoon fuel — go check out jacked-granny.com and use code RUNNERGIRL to save 10%. If you have questions about this episode, DM on Instagram @runnergirldietitian
What this episode covers
If you’ve ever thought, “my gut just can’t handle foods like it used to,” this episode is going to challenge that narrative ….in the best way. Because while it’s easy to blame gluten, dairy, or sugar… the real issue I see over and over again in runners (and active women) is chronic underfueling. In this episode, I break down: How undereating impacts your gut lining and digestion Why low energy availability can lead to increased food sensitivities The connection between gut symptoms and RED-S (Relative Energy Deficiency in Sport) What’s actually happening physiologically (think: slowed motility, reduced enzyme production, and impaired intestinal integrity) Why eliminating more foods might be making things worse…not better If your list of “trigger foods” keeps growing, it might not be your gut failing you… it might be your body asking for more support. This episode will help you start listening differently. Jacked Granny Protein Bars have around 16 grams of protein, the perfect post-run snack or mid-afternoon fuel — go check out jacked-granny.com and use code RUNNERGIRL to save 10%. If you have questions about this episode, DM on Instagram @runnergirldietitian
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Why Your “Food Sensitivities” Might Actually Be Undereating
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