Episode check · Food and fasting
Most people quit GLP-1 drugs within two years, the episode says. Nine studies split on it.
We checked four claims from a 122-minute episode on food, memory and cravings against 50 studies. Two have strong support. Obesity and poor metabolic health in midlife go with more dementia later. Young adults who eat more sugar and saturated fat do worse on memory tests. One claim leans in favor: swapping sugary drinks for diet drinks helps with weight. The studies split on GLP-1 drugs. In the biggest study, 72.2% of US adults with overweight or obesity had stopped by 2 years. Studies of people with type 2 diabetes found fewer stopping. A fifth claim had too few studies to check: that cutting the vagus nerve, which links the gut and the brain, raises dementia risk. The chapters we did not check are in grey.
“How Food Choices Shape Memory, Cognition & Cravings | Dr. Scott Kanoski”
34 chapters · 4 claims checked against 50 studies · 29 chapters not checked yet · checked Oct 13, 2026 Watch on YouTube →
0:50 “They show these memory impairments that last even after you switch them to a healthy diet.” Said on tape, not checked yet.
1:20 “His lab studies how hunger and memory interact and how the mind and body impact appetite” Said on tape, not checked yet.
4:38 “the first application of of GLP-1 based drugs was for diabetes treatment, not for obesity,” Said on tape, not checked yet.
6:23 “I'm not aware of any any data on that.” Said on tape, not checked yet.
13:21 “I'm sort of veering us toward reward and reinforcement and memory” Said on tape, not checked yet.
15:23 “GLP-1 is a big player in that in that process.” Said on tape, not checked yet.
Sweeteners in animal studies
“there's no definitive evidence from the clinical trials in humans that it's good for or or bad for weight loss”
Scott Kanoski, a guest on this episode.
What 10 studies found
3 agree · 1 partly agree · 6 disagree
Six of ten studies found a small benefit from sweeteners in place of sugar. That goes against the idea that trials show nothing either way. One pooled analysis found 0.80 kg less body weight. Another found 1.06 kg less, with no sign of harm. Three studies agree that trials do not show a benefit you can count on, including a review in the BMJ. Compared with water or nothing, one review found sweeteners had no effect on weight.
Computed from 10 studies that test this point, each judged by two readers, in full. Sources land on both sides. 6 more studies are waiting for a full read and do not count yet.
Every study and its exact wordsWhere the sweetener evidence stands
“You know, there's some evidence that if you replace habitual sweetened beverage consumption with habitual artificial sweetened beverage consumption, that that could have some beneficial effects on weight loss.”
Scott Kanoski, a guest on this episode.
What 10 studies found
6 agree · 3 partly agree · 1 disagree
Six of ten studies found that diet drinks or other low-calorie sweeteners in place of sugar help with weight. A pooled analysis adds up many smaller studies; one of 15 trials found the swap modestly cut body weight. A review found that replacing sugary drinks with diet drinks or water cut BMI by about 0.3 units over 6 to 18 months. One Dutch study of 78,286 adults went the other way: people who made the swap gained slightly more weight. Three studies were mixed, including two trials where the diet-drink group lost no more weight than the others.
Computed from 10 studies that test this point, each judged by two readers, in full. 10 more studies are waiting for a full read and do not count yet.
Every study and its exact wordsCloser look
Sweeteners in place of sugar cut weight in most pooled analyses. In place of water or nothing, one review found no effect on weight.
28:04 “the the memory of recent eating will contribute to eating less at the subsequent eating occasion.” Said on tape, not checked yet.
30:16 “we mammals when we evolved, we didn't have food readily available,” Said on tape, not checked yet.
33:36 “that the best diet is one that you can stick to” Said on tape, not checked yet.
35:02 “the hippocampus is somewhat of a canary in the coal mine.” Said on tape, not checked yet.
40:26 “reintroduced it to the animals uh we were able to reverse these memory impairments.” Said on tape, not checked yet.
Midlife health and dementia
“studies showing that midlife dietary patterns and met metabolic status can be associated with an increased risk of dementia”
Scott Kanoski, a guest on this episode.
What 9 studies found
8 agree · 1 partly agree
Eight of nine studies found the link. In 10,276 people examined at ages 40 to 45, obesity in middle age raised the risk of dementia later. A pooled analysis adds up many smaller studies. One of 39 cohorts, with 1,349,857 people, found that higher BMI raised dementia risk when weight was measured more than 20 years before diagnosis. It found the opposite when weight was measured in old age. These studies watch people over time, so they can show a link but cannot prove a cause.
Computed from 9 studies that test this point, each judged by two readers, in full. 10 more studies are waiting for a full read and do not count yet.
Every study and its exact words“studies showing that midlife dietary patterns and met metabolic status can be associated with an increased risk of dementia”
What 6 studies found
4 agree · 1 partly agree · 1 disagree
Four of six studies found that a healthier diet goes with a lower risk of dementia. A pooled analysis found that higher Mediterranean diet adherence cut the risk by 11%. The longest midlife study disagrees: in British civil servants whose diet was assessed at a mean age of 50.2, diet quality was not linked to later dementia. Some of the supporting studies measured diet at age 60 or older, not in midlife.
Computed from 6 studies that test this point, each judged by two readers, in full. 10 more studies are waiting for a full read and do not count yet.
Every study and its exact wordsCloser look
A pooled analysis of 39 cohorts found that higher BMI raised dementia risk when weight was measured more than 20 years before diagnosis. When it was measured less than 10 years before, higher BMI went with lower risk.
48:34 “there is some evidence that exercise can reverse those those memory deficits” Said on tape, not checked yet.
50:54 “We haven't come very far in terms of finding effective treatments for Alzheimer's” Said on tape, not checked yet.
52:38 “there there does seem to be in one small study a positive correlation” Said on tape, not checked yet.
54:07 “We have shown that these devices can rescue the memory impairments from an unhealthy diet.” Said on tape, not checked yet.
55:37 “there's a lot of receptors for these hormones in the hippocampus.” Said on tape, not checked yet.
Sugar, saturated fat and memory in people
“there was connections between habitual sugar consumption and saturated fatty acid consumption and how well they did on these memory tests.”
Scott Kanoski, a guest on this episode.
What 7 studies found
6 agree · 1 partly agree
Six of seven studies found the link, all in young adults. In one trial, 102 lean students who ate a Western-style diet for a few days did worse on memory tests that rely on the hippocampus, the brain's memory hub. Other studies tied higher habitual intake of fat and sugar to worse memory. The effects were small: in 699 people the link was real but slight. One study of 38 women pointed to saturated and trans fats in particular.
Computed from 7 studies that test this point, each judged by two readers, in full. 3 more studies are waiting for a full read and do not count yet.
Every study and its exact words1:05:18 “a standard rodent diet is very healthy, right?” Said on tape, not checked yet.
GLP-1 drugs and nutrition Lead finding
“that people don't take in general, they don't take these GLP-1 drugs for a long period of time. A a majority uh will discontinue treatment within two years of starting”
Scott Kanoski, a guest on this episode.
What 9 studies found
5 agree · 1 partly agree · 3 disagree
Five of nine studies found that most people stop. The largest followed US adults with overweight or obesity: 53.6% had stopped by 1 year and 72.2% by 2 years. A UK study of people with type 2 diabetes found nearly two-thirds stopped within 24 months. Three studies, all in people with type 2 diabetes, found fewer people stopping. A Swedish register found 38.5% had stopped at 3 years.
Computed from 9 studies that test this point, each judged by two readers, in full. Sources land on both sides. 6 more studies are waiting for a full read and do not count yet.
Every study and its exact words“because of the side effects. Another reason for discontinuation in in elderly populations, um there's lean mass loss,”
What 7 studies found
5 partly agree · 2 disagree
No study found side effects to be the main reason people stop. In 288 people who stopped within a year, nearly half stopped over cost or insurance, and 15% over side effects. A US survey of people who had stopped put high cost first (36.1%) and side effects close behind (33.3%). In the STEP 1 trial, 7.0% stopped because of side effects, mostly stomach problems, against 3.1% on placebo, a dummy shot.
Computed from 7 studies that test this point, each judged by two readers, in full. 5 more studies are waiting for a full read and do not count yet.
Every study and its exact wordsCloser look
US adults with overweight or obesity starting liraglutide, semaglutide or tirzepatide
“Accounting for censoring, 53.6% (95% CI, 53.4%-53.9%) discontinued by 1 year, and 72.2% (95% CI, 71.9%-72.4%) discontinued by 2 years.”
JAMA Netw Open, 2025 · other primary study · PMID 39888616
Adults at a US obesity clinic prescribed semaglutide or tirzepatide
“Medication discontinuation was 14%, 24%, 35% and 50% at 3, 6, 9 and 12 months, respectively.”
Diabetes Obes Metab, 2025 · other primary study · PMID 40762026
People with type 2 diabetes in Sweden's national diabetes register
“For GLP-1 receptor agonist users, the cumulative incidence of treatment discontinuation was 23.6% (95% CI 23.2, 23.9) at 1 year and 38.5% (95% CI 38.2, 38.9) at 3 years, when using a grace period of 90 days.”
Diabetologia, 2025 · other primary study · PMID 40316732
Adults with type 2 diabetes in Sweden starting a first GLP-1 drug
“Following a 45‐day gap analysis, the proportion of persistent patients at 1‐year postindex was highest for dulaglutide (85.0%), followed by liraglutide (75.5%), exenatide QW (69.4%) and lixisenatide (66.6%) (Table 2 ).”
Diabetes Obes Metab, 2021 · other primary study · PMID 33289287
1:13:49 “potentially understanding that connection can lead to novel treatments that haven't really been considered or applied before.” Said on tape, not checked yet.
1:15:54 “It's not one common signal, right? So there's there's mechano receptors in the stomach” Said on tape, not checked yet.
1:19:03 “finding is at the end of the meal, the the baseline levels are higher than they were at the beginning.” Said on tape, not checked yet.
1:23:17 “happen even a third time they don't remember eating the meal” Said on tape, not checked yet.
1:27:55 “Yeah, there's a few players that are established. You've hit on on the main ones.” Said on tape, not checked yet.
1:30:06 “and the animals showed memory impairments even though they had never consumed sugar.” Said on tape, not checked yet.
1:39:01 “Yeah, I I now think about the gut so differently than I did even a couple years ago” Said on tape, not checked yet.
1:39:48 “these low sugar fermented foods getting enough fiber um and not stressing too much” Said on tape, not checked yet.
1:40:17 “It was it was the advent of margarine and processed foods really came in.” Said on tape, not checked yet.
1:46:34 “individuals who consume a lot of sugar who stop consuming it or or consume much less they they change their preference.” Said on tape, not checked yet.
1:53:46 “I've I've had a few brushes myself with with the sugar lobby early in my career.” Said on tape, not checked yet.
1:58:21 “we found that that phenomenon requires oxytocin signaling in the hippocampus.” Said on tape, not checked yet.
We go through the episode chapter by chapter and pull out each claim. For every claim we can test, two readers read each study in full and mark whether it agrees, partly agrees or disagrees. A fixed rule turns those marks into the badge, the same rule Precis uses on every page. Nobody writes or edits a badge. Chapters we haven't checked are shown in grey, so you can see everything the episode said.
Every quote is 20 seconds or less and opens the episode at that second. This is not medical advice. Talk to your doctor before you change anything.
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