This episode examines how definitions shape estimates of profound autism, how conduct disorder is described alongside ADHD, and first-person perspectives on ADHD shame and public judgment. It also reviews a parent-facing article on sugar and ADHD. The hosts frame these as population estimates, educational articles, and personal essays—not individual diagnoses.
Prevalence of profound autism declines with new definition
- The Transmitter reported on a study applying a newer Delphi consensus definition to 2022 CDC surveillance data from 13 sites. The Delphi group included more than 70 researchers, caregivers, autistic people, and clinicians.
- The estimate found nearly 17 percent of 8-year-old autistic children in the United States meet the criteria for profound autism, down from a previous CDC estimate of 27 percent published in 2023.
- The Delphi definition requires adaptive functioning far below age level and either an IQ score below 50 or minimal to no verbal abilities.
- Matthew Siegel, who was not involved in the study but is a Delphi group member, said the updated, more precise definition—including adaptive scores—contributed to the drop. He also pointed to growth in the overall autistic population, describing the group meeting the definition as getting smaller and more precise while the denominator gets bigger.
- The hosts noted this does not simply mean fewer autistic children with high support needs; it reflects a different measuring stick and a bigger overall group.
- Prevalence varied by definition: 34 percent higher using the 2021 Lancet definition, 71 percent higher when the IQ cutoff was raised to 70, and 33 percent lower when using only verbal status and adaptive scores without IQ.
- The term “profound autism” is contested. The Lancet Commission coined it in 2021 for autistic people who require 24-hour care as adults and, in most cases, have an IQ score below 50 or limited verbal abilities. The commission also said the term is not appropriate for children younger than 8; this estimate is for 8-year-olds, right at that boundary. The federal Interagency Autism Coordinating Committee proposed its own definition this year that does not mention IQ, contrary to both the Delphi consensus and the Lancet Commission.
- Missing data was substantial: among 7,084 children with autism, 61 percent had recorded IQ information, 74 percent had data to determine verbal status, 56 percent had adaptive score data, and 54 percent had all the information needed. The team used a statistical method to predict missing values. Catherine Lord called the missing data “a huge problem” and said it likely is not random, because IQ scores are harder to capture in children more likely to fall into the profound autism category.
- These are population estimates, not individual predictions. Definitions shape research, service planning, and how needs get described. Siegel said none of the competing definitions directly measure whether a person needs round-the-clock access to an adult caregiver; studies use proxy measures, which he called a key gap.
- Site variation was wide—10 percent in Utah to 35 percent in Laredo, Texas. Joshua Anbar, an investigator on the study, said evaluation and diagnostic practices vary across communities, which could contribute to that range.
Conduct Disorder in Teens with ADHD
- The ADDitude article by Ellen Littman, Ph.D., updated October 20, 2026, describes conduct disorder, or CD, as a severe disruptive behavior disorder marked by rule-breaking, defiance of authority, and physical aggression. ODD—oppositional defiant disorder—also involves problems with self-control and defiance, but many experts see CD as a more severe version on a continuum.
- CD diagnosis requires at least three of 15 behaviors in the previous 12 months and at least one in the previous six months.
- The article says roughly half of all children with ADHD will also develop ODD or CD. Co-occurring CD increases with age and may affect as many as 50 percent of teens with ADHD. About 60 percent of teens with CD also have ADHD. People with both tend to have earlier symptom onset, more severe symptoms, and more emotional and psychiatric problems than those with ADHD or CD alone.
- The article emphasizes that CD is not just ADHD with a bad temper. It describes child-onset CD before age 10, which has a more serious prognosis and more physical aggression, and adolescent-onset CD after age 10, which tends to be less physically aggressive and more likely to include some positive peer relationships. A subtype with limited prosocial emotions—unemotional traits, insensitivity to punishment, fearlessness, planned aggression—is described as most likely to persist into adulthood.
- Early predictors mentioned include a difficult temperament with emotional hyper-reactivity, irritability, and inflexibility, and below-average intelligence with especially poor verbal skills. New research suggests predictors can be identified in children of kindergarten age, and poor academic performance and problematic behaviors should be addressed early because both respond to treatment at a young age.
- For treatment, the article says the greatest successes come from behavioral parent training and cognitive behavioral skills training. Medication is not the main treatment for CD itself, though stimulants can help co-occurring ADHD symptoms.
- The article says many parents wait an average of two years before seeking help. It does not frame this as a moral failure and describes parents who are frightened, frustrated, and humiliated. Both ODD and CD often resolve before adulthood, though outcomes for CD tend to be poorer. The takeaway is early assessment and family support, not shame.
10 Things I Wish I’d Known as a Kid with ADHD
- Elizabeth Broadbent wrote a guest blog for ADDitude about what she wishes she had known as a child with ADHD. She was diagnosed in her 30s. The core message is that ADHD is a diagnosable condition, not a character flaw.
- Practical points include learning how to study and read attentively, recognizing that coasting to an A is not the same as doing one’s best work, and using external structure—such as her Catholic school’s rules and homework books—to help contain symptoms.
- She says medication and cognitive behavioral therapy are acceptable options, though her own parents were unsupportive of medication.
- The essay draws a distinction between symptoms and shame: losing things, tuning out, interrupting, and forgetting deadlines are ADHD-related, not evidence of being dumb or a bad person.
- The hosts framed this as one person’s reflection, not a research study. It does not cite studies. Medication remains an individual decision with a clinician; the essay is not a prescription.
How I Learned to Ignore the Stares
- Brynn Burger’s first-person parenting essay describes taking her son, who has five behavior diagnoses, to a trampoline park as a reward. She decides to jump with him instead of sitting on the sidelines worrying about stares and meltdowns.
- The piece is about how parents respond to public judgment. She says fear of rage, tears, apologies, and whispers can make parents withdraw. She chose to participate, hold hands, and ignore the onlookers.
- The hosts described it as an opinion piece, not research. It is her own choice, not a rule for every family.
- The conversation connected this to the ADHD essay’s theme of shame: understanding the neurology does not remove symptoms, but it can remove some of the blame.
The Sugar Wars
- This is an older parent-facing ADDitude piece, updated in 2024. The article says the evidence is mixed.
- Some studies found no link between refined sugar and hyperactivity. A University of South Carolina study linked more sugar to more destructive and restless behavior in hyperactive children, and a Yale study suggested high-sugar diets may increase inattention in some children with ADHD. The cited studies are from 1980 and 1995.
- The article suggests a 10-day sugar elimination followed by a sugar test—giving a measured dose of sugar and watching. The hosts noted this is not a formal clinical test; it is an at-home experiment, not a validated diagnostic test.
- The article uses hedged language—“could,” “may,” “some kids”—and does not establish that sugar is a universal cause. Families should talk with a clinician rather than let a food experiment replace broader care.
Podcast Transcript
Aaron: Welcome to Living on the Spectrum. I’m Aaron, and I’m here with Jamie. Today we’re starting with a new CDC estimate that nearly 17 percent of 8-year-old autistic children in the United States meet the criteria for profound autism—down from a previous CDC estimate of 27 percent published in 2023. Jamie, this sounds like a big drop, but I suspect the story is more complicated.
Jamie: It is. The Transmitter reported on a study that applied a newer Delphi consensus definition to 2022 CDC surveillance data from 13 sites. The Delphi group included more than 70 researchers, caregivers, autistic people, and clinicians. Their definition requires adaptive functioning far below age level and either an IQ score below 50 or minimal to no verbal abilities.
Aaron: So the lower number is partly because the definition changed?
Jamie: Yes. Matthew Siegel, who was not involved in the study but is a member of the Delphi group, said the updated, more precise definition—including adaptive scores—contributed to the drop. He also pointed to growth in the overall autistic population. He described the group meeting the definition as getting smaller and more precise while the denominator gets bigger.
Aaron: That’s a really important distinction. It’s not simply “fewer autistic kids with high support needs.” It’s a different measuring stick and a bigger overall group.
Jamie: Exactly. And the study itself shows how much definitions matter. Compared with the Delphi definition, prevalence was 34 percent higher using the 2021 Lancet definition, 71 percent higher when the IQ cutoff was raised to 70, and 33 percent lower when the team used only verbal status and adaptive scores, without IQ.
Aaron: So depending on which definition you use, you get a very different picture. What about the term itself? I know “profound autism” is contested.
Jamie: The Lancet Commission coined it in 2021 to describe autistic people who require 24-hour care as adults and, in most cases, have an IQ score below 50 or limited verbal abilities. The commission also said the term is not appropriate for children younger than 8. This estimate is for 8-year-olds, right at that age boundary. And the federal Interagency Autism Coordinating Committee proposed its own definition this year that does not mention IQ, contrary to both the Delphi consensus and the Lancet Commission.
Aaron: And the study found a lot of missing data, right?
Jamie: Yes. Among 7,084 children with autism, only 61 percent had recorded IQ information, 74 percent had data to determine verbal status, 56 percent had adaptive score data, and 54 percent had all the information the team needed. They used a statistical method to predict missing values. Catherine Lord called the missing data “a huge problem” and said it likely isn’t random, because IQ scores are harder to capture in children who are more likely to fall into the profound autism category.
Aaron: That makes me think about the everyday version of this. Parents hear a label and wonder what it means for services, school support, or planning. Does a number like 17 percent tell a family anything directly?
Jamie: Not directly. These are population estimates, not individual predictions. But definitions do shape research, service planning, and how needs get described. Siegel also made a point that none of the competing definitions directly measure whether a person needs round-the-clock access to an adult caregiver. Studies use proxy measures, and he called that a key gap.
Aaron: So even the best label may not capture the actual support a person needs. And the site variation was wide—10 percent in Utah to 35 percent in Laredo, Texas?
Jamie: Yes. Joshua Anbar, an investigator on the study, said evaluation and diagnostic practices vary across communities, which could contribute to that range. So we have a lower estimate, but also a lot of uncertainty and disagreement about what we’re counting.
Aaron: That feels like a good place to pivot, because another article looks at a very different kind of label: conduct disorder in teens with ADHD. Jamie, can you lay out what conduct disorder actually is, and how it differs from ODD?
Jamie: The ADDitude article by Ellen Littman, Ph.D., updated October 20, 2026, describes conduct disorder, or CD, as a severe disruptive behavior disorder marked by rule-breaking, defiance of authority, and physical aggression. ODD—oppositional defiant disorder—is also about problems with self-control and defiance, but many experts see CD as a more severe version on a continuum. CD diagnosis requires at least three of 15 behaviors in the previous 12 months and at least one in the previous six months.
Aaron: And it co-occurs with ADHD a lot?
Jamie: The article says roughly half of all children with ADHD will also develop ODD or CD. The prevalence of co-occurring CD increases with age and may affect as many as 50 percent of teens with ADHD. About 60 percent of teens with CD also have ADHD. People with both tend to have earlier symptom onset, more severe symptoms, and more emotional and psychiatric problems than those with ADHD or CD alone.
Aaron: That’s a lot. I think parents might hear “conduct disorder” and panic, or hear “ADHD” and not realize there’s this more serious pattern to watch for.
Jamie: The article emphasizes that CD is not just ADHD with a bad temper. It describes subtypes: child-onset before age 10, which has a more serious prognosis and more physical aggression, and adolescent-onset after age 10, which tends to be less physically aggressive and more likely to include some positive peer relationships. There’s also a subtype with limited prosocial emotions—unemotional traits, insensitivity to punishment, fearlessness, planned aggression—and the article says that subtype is most likely to persist into adulthood.
Aaron: What about early signs and treatment? Because this sounds like something where families need help early, not blame.
Jamie: Yes. The article points to early predictors like a difficult temperament with emotional hyper-reactivity, irritability, and inflexibility, and below-average intelligence with especially poor verbal skills. It says new research suggests predictors can be identified in children of kindergarten age, and that poor academic performance and problematic behaviors should be addressed early because both respond to treatment at a young age. For treatment, the greatest successes come from behavioral parent training and cognitive behavioral skills training. Medication is not the main treatment for CD itself, though stimulants can help co-occurring ADHD symptoms.
Aaron: And the article says many parents wait an average of two years before seeking help. That’s heartbreaking, but also understandable if you’re frightened or humiliated.
Jamie: It is. The article doesn’t frame that as a moral failure. It describes parents who are frightened, frustrated, and humiliated. And it says both ODD and CD often resolve before adulthood, though outcomes for CD tend to be poorer. The takeaway is early assessment and family support, not shame.
Aaron: That connects to the next piece, which is about shame around ADHD. Elizabeth Broadbent wrote a guest blog for ADDitude about what she wishes she’d known as a kid with ADHD. She was diagnosed in her 30s. The core message is that ADHD is a diagnosable condition, not a character flaw.
Jamie: Right. She writes to her younger self. Some of her points are practical: learning how to study and read attentively, recognizing that coasting to an A isn’t your best work, and that external structure—like her Catholic school’s rules and homework books—helped contain symptoms. She also says medication and cognitive behavioral therapy are acceptable options, though her own parents were unsupportive of medication.
Aaron: I appreciate the line about fooling yourself with a good grade. I can imagine a parent wanting to say “you got an A, great,” but there’s a difference between a grade and actual learning.
Jamie: Yes. But I’d frame the essay as one person’s reflection, not a research study. It doesn’t cite studies. The useful part is the distinction between symptoms and shame—losing things, tuning out, interrupting, forgetting deadlines. She says those are ADHD-related, not evidence of being dumb or a bad person. Medication is still an individual decision with a clinician; the essay isn’t a prescription.
Aaron: And then there’s Brynn Burger’s first-person parenting essay, “How I Learned to Ignore the Stares.” Her son has five behavior diagnoses. She takes him to a trampoline park as a reward and decides to jump with him instead of sitting on the sidelines worrying about stares and meltdowns.
Jamie: It’s an opinion piece, not research. Her point is about how parents respond to public judgment. She says the fear of rage, tears, apologies, and whispers can make parents withdraw. She chose to participate, hold hands, and ignore the onlookers. She’s describing her own choice, not setting a rule for every family.
Aaron: I think that’s a useful community perspective. It’s her choice, not a rule. And it pairs with the ADHD essay: so much of the emotional cost is shame—shame about forgetting, shame about public behavior. Understanding the neurology doesn’t remove the symptoms, but it can remove some of the blame.
Jamie: There’s also a parent-facing ADDitude piece on sugar and ADHD. It’s an older article updated in 2024, but worth a quick note: the evidence is mixed. The article says some studies found no link between refined sugar and hyperactivity, while a University of South Carolina study linked more sugar to more destructive and restless behavior in hyperactive children, and a Yale study suggested high-sugar diets may increase inattention in some children with ADHD. The cited studies are from 1980 and 1995.
Aaron: And the article suggests a 10-day sugar elimination, then a sugar test—giving a measured dose of sugar and watching. That’s not a formal clinical test, right?
Jamie: Right. It’s an at-home experiment, not a validated diagnostic test. The article uses hedged language—“could,” “may,” “some kids”—and it doesn’t establish that sugar is a universal cause. Families should talk with a clinician rather than let a food experiment replace broader care.
Aaron: So what should listeners take from today? One, definitions matter—especially with profound autism, where a lower percentage doesn’t mean fewer people need intensive support. Two, labels like conduct disorder are serious and need early, family-focused help, not blame. Three, ADHD shame is real, and structure, skills, and sometimes medication can help. Four, public judgment is a choice point for parents, though participation looks different for every family.
Jamie: And I’d add: these are population estimates, educational articles, and personal essays, not individual diagnoses. Anyone with specific concerns should talk with qualified professionals. We’ll have links to the original articles on the episode page.
Aaron: Thanks for listening to Living on the Spectrum. Take care.