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Sigma Nutrition Radio

#582: GLP-1 Agonists: Side Effects, Management and Diet – Dr. Spencer Nadolsky

Sigma Nutrition Radio

Danny Lennon

Nutrition, Health & Fitness

4.8 • 633 Ratings

🗓️ 28 October 2025

⏱️ 49 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

GLP-1 receptor agonists have emerged as a groundbreaking tool in obesity treatment. In this episode, Dr. Spencer Nadolsky (an obesity specialist) explains how these medications are now yielding unprecedented weight loss outcomes in people with obesity. 

The discussion centers on GLP-1 agonist drugs like semaglutide and tirzepatide: how they work, how much weight loss they can produce, and why they represent a paradigm shift in obesity management. 

Importantly, the conversation addresses practical aspects of using these drugs, including managing their side effects and optimizing patients' diet and lifestyle while on therapy.

This topic is of great significance to nutrition science, clinical practice, and public health. Obesity is a chronic, relapsing condition that has proven difficult to treat with lifestyle changes alone. The advent of GLP-1 agonists offers new hope by inducing weight loss levels previously seen only with surgical interventions. 

Understanding these medications is crucial for healthcare professionals: it enables evidence-based prescribing, proper patient counseling on diet and side effects, and integration of medication with lifestyle interventions. 

Discussing safety and long-term use is vital, as millions more patients might use these drugs in coming years. From a public health perspective, GLP-1 agonists prompt debates about access and cost, given their high price and life-changing potential.

Timestamps

  • [03:25] Conversation with Dr. Spencer Nadolsky begins
  • [05:24] Mechanism and types of GLP-1 medications
  • [07:55] Efficacy and weight loss results
  • [16:53] Common side effects and management
  • [22:57] Muscle loss concerns and clinical insights
  • [28:09] Addressing nutritional concerns with GLP-1 medications
  • [29:38] Exploring potential benefits beyond weight loss
  • [33:48] Marketing and misconceptions around GLP-1
  • [36:59] Public health and accessibility issues
  • [43:25] Future research
  • [46:16] Key ideas segment (Premium-only)

Related Resources

Transcript

Click on a timestamp to play from that location

0:00.0

Hello and welcome to Sigma Nutrition Radio. This is episode of 582 of the podcast. My name is

0:07.2

Danny Lennon and you are very welcome to the show. Today we're going to be talking all about

0:12.2

GLP1 receptor agonist medications and these have been of course a groundbreaking tool in obesity

0:19.6

treatment with incredibly impressive results

0:22.7

as we've discussed on previous episodes of this podcast and we will revisit some of the magnitude

0:28.5

of effects we're seeing in this particular episode.

0:31.6

But really the goal today was to go and take a look at some of the common questions and concerns or areas of interest

0:40.7

that those of you listening to the podcast still have around these potential medications.

0:46.6

And so some of these have been sourced from our premium subscribers to the podcast who have submitted

0:51.8

what they think are interesting areas to discuss

0:55.6

as well as specific questions.

0:57.7

And so we've compiled some of those and hopefully we'll cover off those throughout this

1:01.7

conversation as well as more general areas to tie it together.

1:06.1

And to discuss this topic of GLP1 agonists, I'm going to be talking with Dr. Spencer Nodalski,

1:12.6

who is a multiple-time guest on this podcast over the years.

1:17.5

He is an obesity specialist and has an incredible familiarity not only with the literature in this area,

1:23.7

but also with the patients that he has within his clinic and that have been using these medications

1:31.3

as part of the cornerstone of their treatment. And so we're going to get into the most commonly

1:38.1

prescribed GLP1 agonists, some a bit about how they work, the magnitude of weight loss we can see.

1:46.6

And from there, turn to some of the most common side effects that are observed and noted, maybe talk to Dr. Ndalski about

1:52.4

ways in practice they can be managed or things that might help to offset some of those potential

1:58.7

side effects that can occur. And then talk about some of the other side effects that can occur.

...

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