Is bubble tea actually bad for you? What the studies really found.

Claim

IS BOBA DANGEROUS?

Catch

NOT PROVEN

Verdict

A TREAT, NOT A HABIT

Bubble tea is everywhere — but a Consumer Reports investigation and several studies are raising red flags. Consumer Reports (September 2025) tested tapioca boba from two US chains (Gong Cha, Kung Fu Tea) and two packaged products (Trader Joe's, WuFuYuan): lead was detected in all four samples. The pearls' main ingredient, cassava, is a root vegetable known to absorb heavy metals from soil. None of the samples exceeded CR's level of concern for lead (the highest, Trader Joe's Instant Boba Kit, reached 83% of that threshold), and the tea's liquid portion showed even more lead per serving than the pearls themselves — so CR's advice was to treat boba as an occasional treat, not an everyday staple; no amount of lead is considered safe, with risks greatest for children and pregnancy. On digestion: case reports describe large tapioca quantities slowing stomach emptying (gastroparesis) and, in rare cases, causing intestinal blockages; the swollen pearls are also a documented choking hazard for children — Singapore media reported the death of a 19-year-old after she inhaled three pearls. On kidneys: in 2023, Taiwanese doctors reported removing over 300 kidney stones from a 20-year-old woman who had been drinking bubble tea instead of water — an extreme single case, not evidence about typical consumption. On teeth: a one-year longitudinal study of 494 Taiwanese children aged 8–9 (Lin et al., 2022) found that children who often consumed handmade drinks like bubble tea had 1.7 times higher risk of new cavities in permanent teeth (95% CI 1.1–2.9). Most bubble teas contain roughly 20–50 g of sugar — comparable to or more than a 35 g can of Coca-Cola. On mental health: a cross-sectional survey of 5,281 Beijing college students (Qu et al., 2023) found higher milk tea consumption/addiction scores associated with more depression, anxiety, and suicidal ideation — a snapshot survey, so association, not proven causation. The catch: the lead stayed below the concern threshold, the dramatic kidney-stone and choking stories are extreme one-off cases, and the mental-health links are observational surveys. An occasional cup is fine; the daily habit is where risks add up.

SOURCES

1. Consumer Reports, "We Tested Bubble Tea for Lead. Here's What We Found" (Kevin Loria, September 16, 2025)
2. Lin, P.-Y., Lee, Y.-C., Hsu, L.-Y., Chang, H.-J., & Chi, L.-Y. (2022), "Association between sugary drinks consumption and dental caries incidence among Taiwanese schoolchildren with mixed dentition," Community Dentistry and Oral Epidemiology, 50(5), 384–390. DOI: 10.1111/cdoe.12683
3. Qu, D., Zhang, X., Wang, J., Liu, B., Wen, X., Feng, Y., & Chen, R. (2023), "New form of addiction: An emerging hazardous addiction problem of milk tea among youths," Journal of Affective Disorders, 346. DOI: 10.1016/j.jad.2023.08.102
4. Taylor, A. (2026), "Bubble tea's dark side: from lead contamination to kidney stones," The Conversation commentary (via ScienceDaily)

For information only, not medical advice. If you have kidney problems, dental concerns, or mental health struggles, please talk to a doctor or dentist.