8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Brain & Nervous System

Narayanan SN, Kumar RS, Kumar N, Prabhakar P, Nayak SB, Bhat PG

Bioeffects Seen

Authors not listed · 2025

Share:

Cell phone radiation at 900 MHz caused brain cell death and abnormal fear responses in young rats after just four weeks.

Plain English Summary

Summary written for general audiences

Researchers exposed young rats to 900 MHz cell phone radiation for one hour daily over four weeks and found significant brain and stress system damage. The radiation caused increased fearfulness, brain cell death in the hippocampus (crucial for memory), and damage to stress hormone-producing glands. This suggests cell phone frequencies may disrupt normal fear responses and brain development.

Why This Matters

This study adds to mounting evidence that cell phone radiation affects developing brains through non-thermal mechanisms. The 900 MHz frequency tested is identical to what many GSM cell phones use, and the one-hour daily exposure mirrors typical usage patterns among young people. What's particularly concerning is that these effects occurred in the hippocampus, the brain's memory center, and involved the stress response system that regulates how we react to threats. The researchers found actual cell death and structural changes, not just temporary effects. This research challenges the industry narrative that non-ionizing radiation is harmless below heating thresholds. The fact that young, developing animals showed these effects after just four weeks of moderate exposure raises serious questions about current safety standards that ignore biological impacts.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2025). Narayanan SN, Kumar RS, Kumar N, Prabhakar P, Nayak SB, Bhat PG.
Show BibTeX
@article{narayanan_sn_kumar_rs_kumar_n_prabhakar_p_nayak_sb_bhat_pg_ce3404,
  author = {Unknown},
  title = {Narayanan SN, Kumar RS, Kumar N, Prabhakar P, Nayak SB, Bhat PG},
  year = {2025},
  doi = {10.1016/j.bbr.2025.115424},
  
}
DOI: 10.1016/j.bbr.2025.115424PubMed: 39788457

Quick Questions About This Study

Yes, this study found apparent cell death (apoptosis) in the CA3 region of the hippocampus after four weeks of daily one-hour exposure to 900 MHz radiation in young rats.
The study showed rats exposed to 900 MHz radiation exhibited increased fear behaviors, including reduced latency to enter dark spaces and more transitions between compartments in behavioral tests.
Researchers found damage to the zona fasciculata of adrenal glands, including cell death-like changes and lymphocytic infiltrates, suggesting disruption of the stress hormone system.
Brain damage was evident after just four weeks of daily one-hour exposure to 900 MHz radiation, with increased perivascular space and cell death in the hippocampus.
Yes, young rats exposed to one hour daily of 900 MHz cell phone radiation for four weeks showed significant brain structural changes and altered fear conditioning behaviors.